OBJ_LOADER_DEMO: Update missing material definitions
LIBS: Force the use of CreateFileW instead of CreateFile2

CreateFile2 is only for win8
COMMON: Fix file extension comparisons

You have to count the null character in the length. Also, compare doesn't do well if you
don't give an explicit length.
LIBS: Correct missing include
OBJ_HMF_CONVERTER: Force textures to dds and auto-convert them
OBJ_HMF_CONVERTER: Allow conversion to output to a different directory

Also, rely very little on the working directory
OBJ_HMF_CONVERTER: Modify ConvertToDDS signature

It makes more sense to have the filePath first, since it is the main topic
of inspection.
OBJ_HMF_CONVERTER: Add some function documentation