mint-arena: Update cg_public.h

The value is used internally by the engine for range checking.
mint-arena: Remove bg_public.h (contaning PERS_SCORE) for server

File is not used by the game code.
mint-arena: Return bg_misc.h to it's rightful name, bg_public.h
Merge remote-tracking branch 'upstream/master'

Conflicts:
	code/game/bg_misc.h