Removed a keyscan layer and added more debug information

Removed a keyscan layer and added more debug information

- Added a print macro for colourful convenience
- Removed the usb_keymap variable as it is no longer needed
- Changed usb_dirty to keymap_change (more accurate description)
- Removed the dumpkeys function and now detect key changes much sooner as well as displaying error messages more often
- Added a warming up information message and removed its error status (as it's not an error)