Moved, renamed sounds, and added code for them

- Added code pieces for handling sounds
- Moved sounds and renamed them using the naming convention
- Added soundset as dependency for returnmirror and awards

mods/awards/api.lua

@@ -310,6 +310,7 @@ function awards.give_achievement(name, award)
 		
 		-- save playertable
 		awards.save()
+		minetest.sound_play("award_award_won", {to_player = name, gain = 0.5*soundset.get_gain(name,"other")})
 	end
 end
 

mods/awards/depends.txt

@@ -0,0 +1 @@
+soundset