First steps towards using UIDs to identify items and regions instead of names,
 so that items and regions can be renamed easily...
More work towards a proper UID-based file name system....
More working-ish using UIDs instead of names...
Ha!  It all appears to work in the GUI now, but now the C side of the house
needs to be made aware of the new scheme...
Initial working end-to-end use of UIDs instead of file names...  Still some
more work to do around recording though...