Propose and implement an Input system.

[Perksey]

Status

• Awaiting proposal (Proposal for a keyboard, mouse, and human input API #16)
• Proposal approved
• Awaiting pull request merge
• Pull request merged and implemented

[Azyyyyyy]

this needs updating lol

[Perksey]

Done

[devvoid]

Input.Common has been implemented, but as of now there aren't any implementations of the API yet.