Removed DCPServer class
Renamed DCPServerBackend to DCPServer.
Moved files dcpserverbackend.{cpp,h} to dcpserver.{cpp,h}. Modified includes.
Renamed DCPServerBackendCentral to DCPServerCentral.
Moved dcpserverbackendcentral.{cpp,h} to dcpservercentral.{cpp,h}. Modified includes.
Rename DCPServerBackendRemote to DCPServerCommand. Renamed DCPServerBackendRemoteStatus to DCPServerCommandStatus.
Moved dcpserverbackendremote.{cpp,h} to dcpservercommand.{cpp,h}. Modified includes.
In dcpserver.h changed defines DCPSERVERBACKEND to DCPSERVER.
Commented useless newBackend code for new remote connection.
Added QUdpSocket to dcpserver, added socket argument to dcpserver* constructors.
Implemented DCPServer::sendPacket().
Added and implemented slot receiveDatagram() connected to sock in DCPServer.
Removed arg remoteType in DCPServerCommand::sayHello. It represent a command station therefore type is always remoteTypeCommandStation.
Refactored code in dcppackethandlerinterface.cpp (variable names, commands order).
DCPPacketHandlerInterface::backendSrv renamed to server.
In CommandPanel constructor: created DCPServerCommand. Renamed srvBack to commandServer.
Added QSqlDatabase to DCPServerCentral's constructor. Removed get/set database from DCPServerCentral.
Created DCPServerCentral in program CentralStation.
Added Addr and Port to newRemote structure.
Added findNewRemoteByPacket to identify remote node via addr,port,timestamp.