Removed some redundant code about checking chunk names of RIFF files
Removed #include "tdebug.h" from a public header
Merge pull request #278 from TsudaKageyu/riff-redundant

Removed some redundant code about checking chunk names of RIFF files
Merge pull request #281 from TsudaKageyu/tdebugh

Removed #include "tdebug.h" from a public header