mint-arena: Don't draw view blood splat if missing shader
mint-arena: Move be_ai_chat.c to Game VM

be_ai_chat.c doesn't need to be in the engine so move it to the Game VM.
mint-arena: Remove 'trap_' prefix from be_ai_chat functions
mint-arena: Remove 'trap_' prefix from be_ai_char functions
mint-arena: update botlib.h for moving be_ai_chat.c to game
mint-arena: Move game-only stuff from botlib.h to game headers
mint-arena: Don't use botlib vars for ai_chat_sys.c
mint-arena: Move screen/font sizes to cg_local.h
Merge remote-tracking branch 'mint-arena/master'
mint-arena: Fix vid_restart while in-game not setting up viewport

Causes text not to render at info screen and crash when opening console.
mint-arena: Make sure console field isn't bigger than buffer
Fix an invalid null deref check in the slider code.
mint-arena: Allow disabling skybox ground surfaces

RTCW SP allows disabling the non-sky surfaces. In RTCW SP, disabling
the sky box actually only disables the ground in the skybox.

Put this behavior at cg_skybox 2 instead.
Merge remote-tracking branch 'mint-arena/master'