Generalize sensorhub-driver-misb-uas connection settings

[csdillard]

To connect to a live stream, the MISB UAS driver has two connection parameters that specify a TCP endpoint in its configuration class: serverIpAddress and serverIpPort.

When the driver is started, the IP and port are just mashed together into one string with a ":" separator that ultimately gets passed directly to the ffmpeg libavformat library.

It would be more flexible to change the configuration class to just have one String property called something like "connectionString". This would allow you to use the full flexibility of libavformat's available protocols. For example, it would allow you to stream from an HTTP(S) source using an https URL string.

The new configuration class might be modified something like this:

package org.sensorhub.misb.stanag4609.comm;
public class Connection {
  // ... other stuff ...

  // Replacement for serverIpAddress and serverIpPort.
  // String that is passed to ffmpeg to tell it where to get streamed data.
  // https://www.ffmpeg.org/ffmpeg-protocols.html
  @DisplayInfo(label = "Connection String", desc = "Connection string that ffmpeg will use to connect to a MISB STANAG 4609 MPEG-TS stream")
  public String connectionString;
}

This would not be backwards compatible with existing configuration. But affected deployments would be trivially easy to update.