This lets up update track keys to prevent duplicates showing up during a
library path update.
Fixes#93: Library sometimes has duplicated tracks
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>
Databases can change either as part of an upgrade or through adding and
removing entries. We can save a bit of memory by removing unallocated
entries during startup.
Implements #47: Automatic database defragment
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>
And perform an upgrade when reading back in. After track tags are read,
we can save the database in the new format and remove the old tags.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>