Spring RTS Engine

Well as the topic reads, they don't. Fixy fixy!

On units, animated textures don't animate until there is a dont-cache piecename; and cache piecename; stop the animation and reset to first frame. On shot models, textures are always animated. Just FYI so it's implemented like in TA.

There is no support for animated textures yet in Spring, infact, spring confuses animated textures with logos right now.