Bug 125

Hi! I was trying to achieve certain detuning effect and found out that LS
doesn't support "Pitch Bend Range" and "Fine Tuning" RPNs. Is this consistent
with GS behaviour and should stay so by design?

I had a look at the gig engine source code and, at first glance, they seem
pretty easy to implement: add a couple of member variables to gig::EngineChannel
(e.g. GlobalPitchBendRange and GlobalFineTune), update them at
Engine::ProcessControlChange and consider them at a couple of appropriate places
in Voice.cpp.

I think the more sensible behaviour would be that GlobalPitchBendRange overrides
pInstrument->PitchbendRange and that GlobalFineTune is added to
pInstrument-FineTune and pDimRgn->FineTune.