FULLPIPE: Implement sceneHandler35()
FULLPIPE: Implement sceneHandler35_stopFlow() and _shrink()
FULLPIPE: Implement sceneHandler35_startFlow()
AUDIO: Cleanup MT-32 code a bit.

This removes overwrites in ReportHandlerScummVM which are simply the default
implementation anyway. A side effect is that this silences/fixes a warning
about the former onProgramChanged to hide an virtual method due to parameter
differences.
KYRA: Slight cleanup.
TONY: Cleanup (don't compare pointer with false).