Removed obsolete pch.h include
AutomatableModel: coding style improvements
AutomatableModel: avoid hiding virtual functions by overload
AutomationPattern: define constants outside class declarations
ControllerView: remove unused member variable
ModelView, Model: coding style improvements
SerializingObject: made saveSettings() and loadSettings() pure virtual

All classes inheriting from SerializingObject should also provide
according functionality, therefore ensure, they implement methods for
loading and saving settings.
Graph: removed unused member variable
ZynAddSubFX: fixed various CLANG compiler warnings
AudioFileProcessor: fixed various CLANG compiler warnings
BitInvader: fixed various CLANG compiler warnings
LB302: fixed various CLANG compiler warnings
OPL2: fixed various CLANG compiler warnings
Papu: fixed various CLANG compiler warnings
StereoEnhancer: fixed various CLANG compiler warnings
TripleOscillator: fixed various CLANG compiler warnings
Vibed: fixed various CLANG compiler warnings
Mixer: fixed various CLANG compiler warnings
Main: fixed various CLANG compiler warnings
More CLANG compiler warning fixes