Cleaned up ContentFile.h Create(size_t hash) so it uses GetPathFromHash, and moved GetPathFromHash definition into header (and made it use slightly more efficient map find instead of count)

Reorganized ContentFile.h members so statics are together at the top. BitDepths has to stay at the top because it's used in one of the statics
Moved (unused) GetDataSize and GetDataType and (not unused) GetPathFromHash definitions into contentfile header
Trimmed down/cleaned up a bunch of contentfile methods and removed unused and duplicate LoadAndReleaseAnimation method. Also reorganized header and cpp a bit so bitmap handling methods are together
Cleaned up header comments

Author: garethyr