[Keymap] Added Massdrop ctrl keymap (#7491)

[Keymap] Added Massdrop ctrl keymap (#7491)

* massdrop ctrl endgame keymap first commit

* massdrop ctrl endgame keymap update

Added double dance functions to toggle mouse layer while keeping LGUI key functionality.
Added led config and related functionality.
Added RGB indicators for effective keys on layers.
Fixed RGB timeout ignoring user set LED flags.
At current state, layer RGB indicators ignore RGB brightness value, will add toggle key later to toggle between current keyboard brightness and max brightness as it's nice to have the indicator RGB at max brightness but still too bright at times.

* updated documentation and added RGB indicator for ctrl and shift in function layer

* Update keyboards/massdrop/ctrl/keymaps/endgame/keymap.c

Co-Authored-By: Drashna Jaelre <drashna@live.com>
* Update keyboards/massdrop/ctrl/keymaps/endgame/keymap.c

Co-Authored-By: Drashna Jaelre <drashna@live.com>
* Various fixes and changes.

Removed backslashed at end of layouts, better looking.
Changed layout names from macro definitions to enum.
Replaced MOD_BIT with MOD_MASK macros.