Fixed issue #340 #321 & #248

Gun table no longer drops vehicle crafting table - https://github.com/FlansMods/FlansMod/issues/340
Vehicles no longer crash when mouse buttons are assigned to various
actions - https://github.com/FlansMods/FlansMod/issues/321
Tank shells now do same damage multiplier vs vehicles as panzershrek - https://github.com/FlansMods/FlansMod/issues/248