Untested changes on itemmirror service

Commented out the old callback methods, don't forget to clean up, once I
confirm it's working.
Tested changes on new itemmirror. Needs persistence
merge from Planz-Lite
Got it to load beyond the first time

addAssociationNamespace throws error when it already exists, need to get
and check if it's null.

Need to test by wiping the XooML2 files, also need to test phantom
associations and move function (persistence of ordering and
synchronicity between data files and application)
Phantom Association is outputting notes correctly, move works

Removed more console.log;
Fixed Phantom Association (notes) output;
Confirmed "move" function works;
"Priority" namespace isn't keeping the sorted order of left side;
More complete implementation of ItemMirror "Save" function