Many more resize control bugfixes and improvements

Too many to list, most pertaining to resolution units and playing nicely
with the command bar.
Allow resolution to be retrieved in current unit or PPI

There are now two properties for resolution: one that always converts to
PPI, and one that returns the current resolution (which can then be
interpreted by also retrieving the unitOfResolution property).  This is
necessary to interact properly with save/load custom presets.