Store colors in flash, copy to ram and use from ram.  Store mode colors
as color ids instead of duplicating the color data.

Later, this will allow configurable colors as the colors can be copied
to the master config and used from that without any ram penalty.
Move colors from ram to master config.  Initialise colors only when
config is reset to defaults.
Update ledstrip unit test.
Add throttle level indicator led mode
Merge remote-tracking branch 'cleanflight/master' into cleanflight-throttle-led