Keymap tweaks

- Brought back Mouse Z for temporary mouse usage
- Combined Mouse and Function Keys into one Layer
- Cleaned up unused code (e.g. combos, key overrides)
- Updated all keyboards with new layer
- Updated documentation
- I think this will be it for now. Making a list somewhere else
for future enhancements

qmk.json

@@ -2,7 +2,6 @@
     "userspace_version": "1.0",
     "build_targets": [
 
-		["crkbd/rev1", "t4corun"],
 		["bastardkb/charybdis/3x5/v2/splinky_3", "t4corun"],
 		["planck/rev6", "t4corun"],
 		["bluebell/swoop", "t4corun"],