Keymap: Added Leader Key Functionality (#4025)

Keymap: Added Leader Key Functionality (#4025)

* deleting arkag branch, forcibly moving changes over to master

* fade_color function added, not tested

* added half functions some stuff

* surround_type function implemented and working.

* added flashing function and removed fading, flashing supports infinite flashing along with controlled number flashes

* added a fade state machine and functionality

* build optimizations, changed fade to bounce between bounds rather than roll over, added a HALMAK layout

* changes to sleep breath function, changed how I will switch to HALMAK

* support for halmak added

* support for activity detection added, condensed fading and flashing state machines, removed support for HALMAK and COLEMAK because arkag is stupid

* changed sleep and inactive behaviors, now the color shifting reverses on state change, yay! save_color and reset_color are made to enable layer color changing to look cooler.

* reformatted some if statements in state detection

* changes to force fade to pause on boot, or plug in.

* Attempting to move over to userspace, pushing to repository for help

* userspace stuff....

* userspace stuff....

* layout changes, working userspace,

Removed left side shift and replaced it with a MT() for LSFT and SPC. Userspace seems to be working properly now! HURRAY

* Layout change

Removed space/shift and reset modifiers to what they were originally. Added homerow modifiers.

* Removed excessive tabs in files

* Moved mods on homerow around...

* changes recommended by @drashna

* removed homerow mods, more flashy lighting!

* changed delays for lighting.

* velocikey code retro fit into userspace to match typing speed

currently "working" but isn't as reactive as I want.

* Readme and other documentation hidden throughout code

* Added a pretty picture

* pretty picture actually added

* More readme updates

* Velocikey now working inside my userspace!

* Changed repo macro and fixed readme

* Removed media layer, moved media control to LAZY layer

* fixed more merge issues when I had to merge...

* implemented some leader key stuff

* removed merge garbage...

* changes requested by @drashna, leader key switch from macros