Crc32tag 0.22b

This content plugin intend to calculate crc32 and to read the crc32 value previously saved from a filename (as example : FileName_[0AA03FF4].bin).

This may useful when having a lot of little files which are constantly separated (like video samples), and cannot supporting a big general sfv or individual sfv's due to incessant moves.

Since 0.13b, it permit also to get and check crc32's values contained in .sfv files.