tracker-miner-fs: Use priority queues for created/deleted/updated/moved items
tracker-miner-fs: Use priority queues for created/deleted/updated/moved items

At the moment each of these still has its own queue, items are usually added
with DEFAULT/LOW priority at the moment.

outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker