- Abstracted USB Module
- Abstracted compiler specific includes for Scan, Macro, Debug, and USB modules
- Updated CMake build files to support changes
- Added abstractions necessary to main.c as well as a compiler specific include file

- Shouldn't affect anything, and will allow for greater buffer clearing control

- Typing and modifiers fully working
- Still some features left to implement
  * Stop input
  * Diagnostic test
  * Setting interval before starting repeat rate
  * More comments
  * Handling LED stats

- LEDs are working
- Reset command is working
- Basic typing is working (USB side drops some characters)
- Changing repeat rate is working
- Querying modifiers and LEDs is working
- Initial layouts are complete
- Modifiers are not fully working yet