Lightzone Switch component

[kk1201]

I noticed that the lightzone script didn't have any functionality to respond to light switch events. I added a LightzoneSwitchComponent.gd script to solve this. Parenting it to a LightzoneComponent and connecting the switched signal from a Cogito_Switch.gd node to the _on_switched function, this should should make the parent lightzone automatically follow the switch's state by enabling and disabling the Area3D::monitoring property.

Reason
Small change, follows composition, I think it makes sense for it to be included in the template since it's a big feature of a lot of immersive sims, allows for new gameplay and level design options :)

No side effects
Will only affect lightzones, and not connecting the signal or setting the switchable flag to false will make the lightzone behave as previously. CogitoSwitch.gd::is_on initial state is respected. I added a LightzoneSwitchComponent to the LightzoneComponent prefab and added a LightzoneComponent child to the CeilingLamp prefab as an example but feel free to make me restore them to their previous state.

Downsides
Uses get_parent(), which violates pure composition. However the use-case is incredibly obvious based on the name and documentation, and it shouldn't pollute anything else, so I feel like using it in this limited scope makes sense.

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switchable-lightzone-example.mp4

[Phazorknight]

This is awesome.
I have neglected looking into Lightzone's working on other stuff.
Having the Lightzones respond to switch state makes perfect sense and your implementation is great.
Approved!