AVRProcessor: new avr_t argument added to RESET signal, use to initialize components
RegulatedAVRProcessor: standardize doxygen code comments
HybridAVRProcessor: standardized doxygen code comments
RRAVRProcessor: standardized doxygen code comments
AVRProcessor: standardized doxygen code comments and removed the uneeded avr_t parameter from the RESET(avr_t* avr) signal which will allow external plugins to use an AVRProcessor with no simavr dependencies
AVRProcessor: new abstract base class (AbstractAVRProcessor) with no simavr dependancies for use in external plugins