Renamed SDRDaemonSource/Sink to RemoteInput/Output
The SDRDaemonSource and SDRDaemonSink device plugins have been renamed to RemoteInput and RemoteOutput respectively. SDRDaemon was a reference to an obsolete project which code has been integrated in SDRangel. The "remote" based terms better reflect what these plugins are actually.
Other changes
- PlutoSDR: get low pass analog filter limits from the device instead of being hardcoded.