Style Cleanup: remove preprocessor indentation (updated wiki style guide too)
Code Cleanup: de-duplicate constraint checks with armature join
Add ItemDestroyable to the cache limitor

This callback is used when cache limiter needs to remove
some cached objects when running out of limit.

From blender side it's used to keep painted images always
in memory.

This fixes issue when painted images were removing from
the memory after image cache rewrite.
Fix T37898: blenderplayer painfully slow in recent builds

Issue was caused by recent image cache rewrite and root of
the issue goes to the fact that blender player doesn't
initialize cache limiter and it uses 32meg of memory only.

This leads to infinite image loading/freeing.

For now disabled cache limiter in game engine, this brings
back old behavior.

In theory we might be smarter here, but better caching
policy is to be discussed.
Merge branch 'master' of http://git.blender.org/blender