Introduce Model

Modules/include/Multiplier.h

doc/ApplicationPVModel_concept.graphml

include/Application.h

include/ApplicationModule.h

include/ControlSystemModule.h

include/DeviceModule.h

include/EntityOwner.h

include/HierarchyModifyingGroup.h

include/InversionOfControlAccessor.h

include/Model.h

include/Module.h

include/ModuleGroup.h

include/ModuleImpl.h

include/VariableGroup.h

include/VariableNetworkNode.h

include/VirtualModule.h

src/Application.cc

src/ApplicationModule.cc

src/DeviceModule.cc

src/EntityOwner.cc