Add sound names

[garsipal]

Add sound names required for map sounds and game sounds to play, instead of relying on arbitrary integers.

Declaration on CubeScript:

registersound "jump" "player/jump01" 80

Example on C++:

playsound("jump", player);

Declaration on CubeScript:

mapsound "distantShip" "ambient/metald_01" 120

Example on CubeScript:

trigger "playSound" "proximity" [
    triggersound "distantShip" $eventsource
]