REQ: To add sfz with flac/ogg samples and new format to conversion

[L0w1y]

Please add a new format for sf3/sf4 conversion. These formats are from the soundfont family, only they contain compressed samples. The latter (sf4) is not used anywhere yet.... I also ask you to add the ability to select the type of samples in the source file for the sfz format. It supports not only wav, but also flac, ogg...