* tweaked echo sound
* tweaked SFX
* various optimizations
* code clean up

* Now player can drop JDAM bombs too
* Few optimizations

The crater and destruction induced by bomb are now optional via script parameters (see ini_bomb.sqf).
Both parameters are boolean and they can be enabled or disabled by making them true or false.
This could be useful if you only want the "fireworks"/visual part of the bomb script.