* bugfix: key highlighting of active keys on the virtual keyboard is now
working on multiple invocations from the sampler as well
* renamed misleading names regarding the gig format's "keyswitching"
feature (the dimension is now displayed as "keyswitching" instead of
"keyboard" in the dimregchooser widget and the two parameters for
defining the actual keyswitching area on the keyboard in the instruments
properties dialog are now called "Keyswitching range low/high" instead of
"Dimension key range low/high")