Lots of changes.

1.Added Utf8 String.
2.Added RINLINE macro to OO.h.(force inline)
3.String speed up.
4.Added func 'Base64_Decode_Int12' to Base64.
5.Added Tune_ namespace to enum Tune_PitchNameMode.
6.Fixed some bugs.
Add anonymous prefix `__` before every functions in this file.