Add support for the US L keyboard layout and fix the US S layout.
Update the readme to reflect US L support.
Add support for building on Windows with MSVC.
Update test.c with a brand new sequential test, rainbow arrow keys in test_multilayer as the comment says they should be, and a cross-platform sleep function (sleep_ms).
Add support for the US L keyboard layout and fix the US S layout. Update the readme to reflect US L support. Add support for building on Windows with MSVC. Update test.c with a brand new sequential test, rainbow arrow keys in test_multilayer as the comment says they should be, and a cross-platform sleep function (sleep_ms).