Create ApplicationHandler

[Andre601]

Adds the ApplicationHandler class containing the handle method previously used in CmdApplication

This move was made to eventually remove the command in favour of the button-based approval/denial of applications.

I also decided to make the bot reply more vebose by listing the steps it currently goes through.
Tho, due to how the queue() method works (That being async) could the bot already be done before the messages are fully updated...
Only alternatives would be either logging in the console, or using the thread-blocking complete()

[gmitch215]

Cool. I'll test this out soon.

[gmitch215]

Had some issues with the RegEx.

Decided to just parse the markdown directly. Fields in Embeds are ordered, with 0 and 1 always being the user and repository fields respectively, so I cleaned up some things there.

You also forgot to close the bold text for the final success message.

[Andre601]

I personally would still have checks to ensure the fields are user and repo respectively. Just in case there would be a random edge-case that could break this check...

[gmitch215]

@Andre601 Wouldn't we deny them if they violate the usual URL rules (since it would be an invalid user & repo location)?

Will also implement edge case tests with #19.

[Andre601]

I guess... So it's fine then.