OBS Lua Control Visca-over-IP based cameras 2.7

New features for the script plugin: support for PTZOptics and Hotkey actions.

- PTZOptics support: The script settings have two new configuration items: the port and protocol mode. The port defaults to 52381 and can be changed when needed (e.g. to 1259 for a PTZOptics camera). The protocol needs to be set to 'PTZOptics' to make the script talk the Visca dialect of PTZOptics.
- Pan, Tilt & Zoom actions can now be performed using a hotkey (for camera's that support pan, tilt or zoom). The action will start when the key is pressed and stops when the key is released.

For more details and usage instructions, see obs-visca-control on Github.

This updated improves the Visca implementation:

• Fix for a resource leak; socket connections were not closed, claiming a new connection for every send command.
• Connections are now re-used for each camera. This also means that the message counter (part of the Visca protocol header) is now used properly.

This updated includes a few enhancements and minor changes to the documentation:

• The visibility (enabled/disable) of the Visca plugin source is now respected. When the plugin is disabled in a scene, the action is not executed.
• A new options is added to the source settings of the plugin to run an action on preview only when the camera is not active on program. This prevents accidental changes to the camera as long as it is live for broadcasting.