This makes easytag compile against the newest version of libmp4v2. I
haven't done extensive testing, but I have tried it on a number of files
with adding/removing/changing tags and it seems to all work fine.
Let me know if further updates/changes would be useful.
- Use new API functions
- Actually remove tags when requested instead of setting to empty string
- Report errors to log when errors occur in reading tags
src/mp4_header.c | 6 +-
src/mp4_tag.c | 189