Update the XCode projects, and fix several compilation problems.
- mark aiAnimMesh data structures as *NOT CURRENTLY USED*. They are, however, still contained and visible because some ports may be relying on their presence. - add SimpleAssimpViewX sample provided by drparallax. Thanks! (http://sourceforge.net/projects/assimp/forums/forum/817654/topic/3917829) git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@843 67173fc5-114c-0410-ac8e-9d2fd5bffc1f