Arrange directory structure. Game-specific files are moved to subdirectories.
Move external libraries to dependencies directory.
Add yaml-cpp 0.5.1 for future use.
Minor cleanups.
Rewrite MP2kScanner with help of sappy_detector included in GbaMusRiper. This is much readable than before. Additionally, it fixes issue #16.
RawFile::size vs. RawFile::GetSize (they are so confusing...)