added menu to Options > Chen's Addons

minor change to make sounds play more consistent

added some convars

doesn't play use sound if holding down +attack2 (right mouse button) (this is not vanilla like behavior but acceptable for custom weapon stuff)

correction to a function to no longer spam the sound

made it even more accurate

made the sounds play more accurately. (it will now play it when on func_tracktrain and func_tank and so on)