- Fix out-of-bounds reads in ID3 parser for unsynced frames.
- Fix out-of-bounds read for RVA2 frames with non-delimited identifier.
- Fix implementation-defined parsing of RVA2 values.
- Fix undefined parsing of APE header for skipping. Also prevent endless loop on premature end of supposed APE header.
- Fix some syntax to make pedantic compiler happy.
Signed-off-by: Pierre-Yves <pyu@riseup.net>