SDRdaemon plugin and make install

• Implemented a source plugin for SDRdaemon utility. See SDRdaemon on this Github repository for more information. Thanks to this plugin SDRangel can receive samples sent from a SDRdaemon instance anywhere on the network. Please note that the address you specify in the plugin is not the address where SDRdaemon runs but the address of the computer running SDRangel as seen from the computer running SDRdaemon. In fact address and port should match between SDRdaemon and SDRangel. For example if SDRdaemon runs on 192.168.1.4 with this command: ./sdrdaemon -t rtlsdr -I 192.168.1.3 -D 9090 -C 9091 -z 60000 -c freq=433880000,srate=1000000,ppmp=58,gain=40.2,decim=4,fcpos=2 Then on 192.168.1.3 where SDRangel runs the address 192.168.1.3 and port 9090 should be specified in the plugin UI.
• Also implemented install and uninstall targets with the cmake system so that installation can be done with just make install