Drop sounds starting with * before allocating sfx slot

Causes handle 0 to be returned by S_RegisterSound.
Remove an unneeded check in base sound copied from openal
Merge remote-tracking branch 'ioquake3/master'
Read defaultSound from gameconfig.txt
Merge remote-tracking branch 'spearmint/master'

Conflicts:
	code/client/snd_dma.c
	code/client/snd_openal.c