IModulator: removed getModulation().
IModulator, OFDMModulator: cosmetics.
LayeredEncoder: serializer is obligatory.
QAM64Modulation: removed a duplicated kMOD factor from its encodingTable.
Modulations: moved src files from layered/modulations to physicallayer/modulation.
ISymbol: added an interface for modulation symbols.
APSKSymbol: added a class for APSK symbols. It just wraps the complex number class.
Modulations: added a static singleton instance to each modulation class.
Modulations: Complex replaced with APSKSymbol.
APSKModulationBase: followed symbol representation changes.
IModulation: added interface.
Modulation: removed obsolate Modulation.h,.cc, and IModulationScheme
LayeredEncoder: not all component is sufficient to get the LayeredEncoder to work.
IModulation: missed INETDefs header.
APSKModulator: added implementation.
SignalBitModel: code formatting.
IAPSKModulation: inherits from IModulation.
ISignalSymbolModel: IModulationScheme replaced with IModulation, symbols are contained in a std::vector<ISymbol*> vector.
SignalSymbolModel: followed ISignalSymbolModel changes.