This function is for both adding and removing tracks, and only returns
false. Tracks will only be added and removed through the update
function.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
The pl_library_init() function is used to allocate a playlist for each
library path already in the database, and pl_library_deinit() is then
used to free this memory during cleanup.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>