[Feature Request] Add websocket request to move sources

[LordTocs]

OBS Websocket now has an api for plugins to add websocket requests.

The base OBS Websocket has a SetSceneItemTransform which instantly moves a scene item. It would be awesome to have a MoveSceneItemTransform which would use obs-move-transition to update the item's transform over a requested amount of time.

There's an example of a plugin's websocket request here: https://github.com/obsproject/obs-websocket/blob/master/lib/example/simplest-plugin.c The functions of note are obs_websocket_register_vendor and obs_websocket_vendor_register_request.

Another interesting websocket request would be to also have an equivalent of SetInputSettings. Using the move-value-filter logic to update input settings over time from a websocket request.

[exeldro]

I like the idea, will add it to my to do list.