Restart output if output settings are updated

[BitRate27]

This PR is to fix issue #1438 [Bug]: Output Name not updated when changed via Websocket

To fix the issue, the ndi_output_update callback was modified to:

1. Check if the output is running, if so, stop it.
2. Save the changes to the config depending on what output was updated.
3. Restart the output if it was running.

This fixes the issue reported because the ndi_output_update callback is called when the settings are changed by the websocket API.

Here is a web page used to test this PR. The web page will allow the user to change the output settings via the websocket API:
obs_output_settings_modify.html

To test this PR:

1. Download the html file.
2. Open the html file in a web browser
3. Launch OBS
4. Select Connect on web page
5. Select NDI Main Output or NDI Preview Output
6. Change the name and/or group and select Apply
7. See the NDI name change in NDI Studio Monitor
8. Open DistroAV NDI Settings dialog
9. Verify name and/or group changed

[BitRate27]

There are also issues with the StartOutput and StopOutput websocket commands not reflecting in the OutputSettings dialog. Will include fixes for that issue in this single PR. Original issue expanded to include this new found issue.