* Re-enable mouse keys to fix Chrome OS media keys
I'm not sure if there's a bug in Chrome OS, QMK, or both, but
EXTRAKEY_ENABLE isn't sufficient for media keys to work on Chrome OS.
Instead, MOUSEKEY_ENABLE is also required.
* Remove unnecessary SPLIT_USB_DETECT for Lily58
I've since swapped my Lily58 back to Elite-C v2 controllers with working
VBUS detection.
* Move Crkbd Esc and Ctrl keys; add some shortcuts
* Move MC_ALTT to userspace for cross-board support
* Sync Lily58 keymap with Crkbd
* Fix typos
027570a21b