Remove some unused defines from msg.c
Use Q_strncpyz in G_AddRandomBot
Remove MSG_WriteDeltaUsercmd and MSG_ReadDeltaUsercmd
Make buttons more modable

Make generated buttons the highest button bits.
Move game/cgame specific BUTTON_*s to bg_misc.h
Move +/-attack to cgame.
Make engine bot debug tool check for any non-generated button instead of attack (because it's game/cgame only now).
Merge remote-tracking branch 'upstream/master'

Conflicts:
	code/game/g_bot.c
	code/qcommon/msg.c