Initial yanking out of the audio items tab and fixing the obvious
regressions...  Still need to fix the buttons and controls to actually
do something useful again...
Working-ish version of the new audio editing/sequencing, but still more
polishing to be done before merging this branch.
More fixes to the new audio items, still a few more bugs to fix...
Double click to show properties...
Only send out updates if something changed, which also seems to have made
the audio UI much more fluid...
Oops...  Also have to reassign that string to the new value...
Many cleanups and fixes to the new audio items...