REQ: Add sceneitem set-position

[Luzifer]

As an user having my games I stream defined as StreamDeck buttons, I want to move my camera on the generic scene, matching to the game I just set for streaming, using obs-cli:

# twitch_setgame.sh # ...
# obs-cli sceneitem set-position 'GameScene' 'Camera' '<x>' '<y>'

Should be possible by modifying the position inside the transform:
SetSceneItemTransform

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Possible extension to this request: Move relatively

# obs-cli sceneitem set-position 'GameScene' 'Camera' '+20' '-50'