Updated comment to InputControls class
Volume control removed from palettes

Palettes, MidiChordDef and MidiChord no
longer contain volume information.
Initial channel volumes can be set using the
SetOutputMasterVolumes(...) function
(in CompositionAlgorithm.cs).
Channel volumes can be changed using
a performance controller, but are never
changed again in the score.
TODO clean up the palette layouts.
Cleaned up palette layouts

Moved controls up to fill the space left by
missing volume controls.
Done for both PaletteForm and
PercussionPaletteForm.