feat(ffi): add a client example using Avalonia

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/.gitignore

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+# Ignore directories
+bin/
+obj/
+
+# Ignore files
+*.user
+*.userosscache
+*.suo
+*.userprefs
+*.dll
+*.exe
+*.pdb
+*.cache
+*.vsp
+*.vspx
+*.sap

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Devolutions.IronRdp.AvaloniaExample.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/App.axaml.cs

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+using System;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace Devolutions.IronRdp.AvaloniaExample;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/Devolutions.IronRdp.AvaloniaExample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.10" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.10" />
+    <ProjectReference Include="../Devolutions.IronRdp/Devolutions.IronRdp.csproj" />
+  </ItemGroup>
+</Project>

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/Devolutions.IronRdp.AvaloniaExample.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Devolutions.IronRdp.AvaloniaExample", "Devolutions.IronRdp.AvaloniaExample.csproj", "{B374556F-70F4-4B70-90AE-6DF00C532240}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B374556F-70F4-4B70-90AE-6DF00C532240}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B374556F-70F4-4B70-90AE-6DF00C532240}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B374556F-70F4-4B70-90AE-6DF00C532240}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B374556F-70F4-4B70-90AE-6DF00C532240}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1DD5DE59-5AB4-4F5F-A2AC-CA4D7012F56E}
+	EndGlobalSection
+EndGlobal

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/KeyCodeMapper.cs

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+using Avalonia.Input;
+using System;
+using System.Collections.Generic;
+
+public static class KeyCodeMapper
+{
+    private static readonly Dictionary<PhysicalKey, ushort> KeyToScancodeMap = new Dictionary<PhysicalKey, ushort>
+    {
+        {PhysicalKey.Escape, 0x01},
+        {PhysicalKey.Digit1, 0x02},
+        {PhysicalKey.Digit2, 0x03},
+        {PhysicalKey.Digit3, 0x04},
+        {PhysicalKey.Digit4, 0x05},
+        {PhysicalKey.Digit5, 0x06},
+        {PhysicalKey.Digit6, 0x07},
+        {PhysicalKey.Digit7, 0x08},
+        {PhysicalKey.Digit8, 0x09},
+        {PhysicalKey.Digit9, 0x0A},
+        {PhysicalKey.Digit0, 0x0B},
+        {PhysicalKey.Minus, 0x0C},
+        {PhysicalKey.Equal, 0x0D},
+        {PhysicalKey.Backspace, 0x0E},
+        {PhysicalKey.Tab, 0x0F},
+        {PhysicalKey.Q, 0x10},
+        {PhysicalKey.W, 0x11},
+        {PhysicalKey.E, 0x12},
+        {PhysicalKey.R, 0x13},
+        {PhysicalKey.T, 0x14},
+        {PhysicalKey.Y, 0x15},
+        {PhysicalKey.U, 0x16},
+        {PhysicalKey.I, 0x17},
+        {PhysicalKey.O, 0x18},
+        {PhysicalKey.P, 0x19},
+        {PhysicalKey.BracketLeft, 0x1A},
+        {PhysicalKey.BracketRight, 0x1B},
+        {PhysicalKey.Enter, 0x1C},
+        {PhysicalKey.ControlLeft, 0x1D},
+        {PhysicalKey.A, 0x1E},
+        {PhysicalKey.S, 0x1F},
+        {PhysicalKey.D, 0x20},
+        {PhysicalKey.F, 0x21},
+        {PhysicalKey.G, 0x22},
+        {PhysicalKey.H, 0x23},
+        {PhysicalKey.J, 0x24},
+        {PhysicalKey.K, 0x25},
+        {PhysicalKey.L, 0x26},
+        {PhysicalKey.Semicolon, 0x27},
+        {PhysicalKey.Quote, 0x28},
+        {PhysicalKey.ShiftLeft, 0x2A},
+        {PhysicalKey.Backslash, 0x2B},
+        {PhysicalKey.Z, 0x2C},
+        {PhysicalKey.X, 0x2D},
+        {PhysicalKey.C, 0x2E},
+        {PhysicalKey.V, 0x2F},
+        {PhysicalKey.B, 0x30},
+        {PhysicalKey.N, 0x31},
+        {PhysicalKey.M, 0x32},
+        {PhysicalKey.Comma, 0x33},
+        {PhysicalKey.Period, 0x34},
+        {PhysicalKey.Slash, 0x35},
+        {PhysicalKey.ShiftRight, 0x36},
+        {PhysicalKey.PrintScreen, 0x37},
+        {PhysicalKey.AltLeft, 0x38},
+        {PhysicalKey.Space, 0x39},
+        {PhysicalKey.CapsLock, 0x3A},
+        {PhysicalKey.F1, 0x3B},
+        {PhysicalKey.F2, 0x3C},
+        {PhysicalKey.F3, 0x3D},
+        {PhysicalKey.F4, 0x3E},
+        {PhysicalKey.F5, 0x3F},
+        {PhysicalKey.F6, 0x40},
+        {PhysicalKey.F7, 0x41},
+        {PhysicalKey.F8, 0x42},
+        {PhysicalKey.F9, 0x43},
+        {PhysicalKey.F10, 0x44},
+        {PhysicalKey.NumLock, 0x45},
+        {PhysicalKey.ScrollLock, 0x46},
+        {PhysicalKey.Home, 0x47},
+        {PhysicalKey.ArrowUp, 0x48},
+        {PhysicalKey.PageUp, 0x49},
+        {PhysicalKey.NumPadSubtract, 0x4A},
+        {PhysicalKey.ArrowLeft, 0x4B},
+        {PhysicalKey.NumPad5, 0x4C},
+        {PhysicalKey.ArrowRight, 0x4D},
+        {PhysicalKey.NumPadAdd, 0x4E},
+        {PhysicalKey.End, 0x4F},
+        {PhysicalKey.ArrowDown, 0x50},
+        {PhysicalKey.PageDown, 0x51},
+        {PhysicalKey.Insert, 0x52},
+        {PhysicalKey.Delete, 0x53},
+        {PhysicalKey.F11, 0x57},
+        {PhysicalKey.F12, 0x58}
+    };
+
+
+    public static ushort? GetScancode(PhysicalKey key)
+    {
+        if (KeyToScancodeMap.TryGetValue(key, out ushort scancode))
+        {
+            return scancode;
+        }
+        return null;
+    }
+}

ffi/dotnet/Devolutions.IronRdp.AvaloniaExample/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d" d:DesignWidth="1980" d:DesignHeight="1080"
+    x:Class="Devolutions.IronRdp.AvaloniaExample.MainWindow"
+    Title="Devolutions.IronRdp.AvaloniaExample">
+
+    <Canvas Name="MainCanvas" Width="1280" Height="800" Background="Black" 
+        PointerPressed="Canvas_OnPointerPressed" PointerMoved="Canvas_PointerMoved" PointerReleased="Canvas_PointerReleased"
+        HorizontalAlignment="Center"
+        VerticalAlignment="Center"
+    />
+</Window>