Shredder model fix addon

All Nod's factions Quad Shredder Turrets now shows their build-up animation properly and have a fixed model, they also won't show anymore their shooting effect when they under damage status (Yellow health bar),

However there's a rare glitch that have random trigger which causes all type of Quad Turrets to stop move/freeze and also apparently re-trigger the Quad Shredder's shooting effect bug again (and make it even worse),
I have no clue what trigger it and how to fix it.

This fix also include some small attempt to fix the DC issue with the quad turret

All included files are ready to compile.