Refinements of the Nextion displays

* better looking fonts
* DMR talker alias is shown (in green) if received
* font is automaticly  adapted when TA would be too long for display
* DMR ID, call or TA (depending on what was shown) goes to gray at voice end
* "MMDVM stopped" at rest screen when MMDVMHost application is ended
* active network interface and IP address on rest screen so you know how to contact it

DMRSlot.h

@@ -61,6 +61,7 @@ private:
 	unsigned int               m_rfEmbeddedReadN;
 	unsigned int               m_rfEmbeddedWriteN;
 	unsigned char              m_rfTalkerId;
+	unsigned char*             m_rfTalkerAlias;
 	CDMREmbeddedData           m_netEmbeddedLC;
 	CDMREmbeddedData*          m_netEmbeddedData;
 	unsigned int               m_netEmbeddedReadN;