Additional layer with address filtering for EasyLink

[rei-vilo]

Two modes:

• Basic usage mode: begin(), transmit() and receive()
• Address filtering mode: getAddressLocal(), setAddressFilter(), setAddressDestinationTX()

Select mode in the related examples: sub1GHz_RX_Layer and sub1GHz_TX_Layer

///
/// @brief    Address filtering
/// @{
#define WITH_ADDRESS_FILTERING 1 ///< activated
#define WITHOUT_ADDRESS_FILTERING 0 ///< desacticated
#define ADDRESS_FILTERING WITH_ADDRESS_FILTERING ///< mode
/// @}