Texture updates + Gun Turret bodygroup added

Texture update. Models now sport normal maps and exponent textures for better lighting management. Alt form for both now sport turrets from the original game (via bodygroups).

None Provided

Goldfire's model's been redone with a clean rip from the game. Textures have been updated to align with other TD ports. Glass textures updated.

Hand posing and hands have been fixed for Goldfire.

Tire textures updated.

None Provided

Cleaned up Bumblebee model. Improved normal lighiting and face posing. Textures are now in line with other Devastation model ports.