Fix an off by one error causing most keys to be shifted one to the
right, due to the missing backslash (\) key in the top row.

- Added layout files for 50 key and kishsaver
- Not yet working (some USB issues on AVR to debug)
- Fixed an OSX issue when building AVR
- Cleanup

- Automatically downloads the kll compiler if not found
- Added capability files to each of the module that currently have them
- Split modules.cmake so kll.cmake could influence build targets (also needs info from modules.cmake)
- Updated .gitignore for kll compiler directory
- Added documentation on how to manipulate layouts using CMakeLists.txt
- Cleanup of old layout files