ShaderWallpaper v2.0-alpha

This is an alpha release of version 2.0 of ShaderWallpaper
This pre-release contains experimental features.

Changes:

• Loads shader .frag files directly
• Load from shadertoy.com directly
• Load iChannels (only textures work so far)
• Change the global shader speed
• GUI customization of shaders
  • Colors (more accurately any vector3)
  • Variables
• Pause on Maximize/Fullscreen
• Pause/Resume button