Formalizing code module structure and inheritance (Large Commit)

- Commenting cleaned up
- usb_keyboard_debug is not finished yet in terms of cleanup (needs DEBUB_PRINT #ifdef's)
- Added LoadFile script generation
- Formalized KeyIndex and USBKeys data containers
- Split parts of scan_loop into Macro, USB, and main.c
- Added interface to USB modules
- Added interface to Macro modules
- Added proper Debug module enable/disable

LoadFile/bash

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+#| Loads the hex file onto the teensy
+
+sudo teensy-loader-cli -mmcu=@MCU@ -w @TARGET_HEX@
+
+exit 0
+