Reverted sandbag impact and destroy effects

Changed mod name from "Old Forts: Release" to "Old Forts: Beta/1.0" (I realized a lot of sprite changes were from forts beta)
Fixed errors in console when disabling Tons of Guns. (non-critical error).

Mortar angle reverted.
Forced mortar angles unlocked.
AA AI will now target launching missiles.

Reverted plasma laser sprite.
Reverted sniper sprite.
Lowered mass parameter requirement for the large structure_shock soundevent.

typo caused 20mm to do barely any damage