added explosions to the end of the projectile hit
Merge remote-tracking branch 'origin/Adam' into Jody
merged
added a  fire rate for  weapon and audioclip for feel. Added a wait for shot distance to give a feeling of projectile travel.
Modified gun sound and added a explosion sound
added speed of sound calculation to the explosion
Merge remote-tracking branch 'origin/Jody' into Adam

Conflicts:
	DDD/DDD.userprefs