First stable version of SRTKBandMFReceiver. The structure is the same of the

SRT7GHz component. The core of the component is the SRTKBandMFCore class, which inherits from
the CComponentCore writen by Andrea. I changed something in the CCompenentCore in order to 
use the existing code with the SRTKBandMFCore and possibly with others receiver cores:
    + I made the setMode method of the CComponentCore pure virtual;
    + I moved some methods and attributes from private to protected;
    + I removed the updateLNA() method, which now must be implemented in the derived class.