audtag: Write ID3 tags to beginning of file.
Fix parsing of ID3 tags with footer at beginning of file.
audgui: Fix crash due to ministatus_timeout_proc being called after infowin is destroyed.
audtag: No need to write ID3 footer for tags at beginning of file.
Write the same version of ID3 tag (2.3 or 2.4) that was already there.
ID3v2.3 tags support only UTF-16, not UTF-8.