Add engine builds to the-mirror repo as i need the debug_template for the headset

Fix env

Remove binary stripping from android

Android template zip fix

fix artefact name

GameUI must use a singleton from now on to ensure we can add the UI to a SubViewport

The SubViewport is used only for VR Mode and it will add optional VR nodes.
I successfully avoided needing to write a lot of await code with GameUI.instance.get method which is great

Format fixes

…ctions

We'll be using an OpenXR composition layer for the Game UI to ensure its clear and concise.

We can probably also package the game without the VR dependencies in certain contexts.

I fixed a few other bugs in the code that kept spamming.

- Move all the sub viewport logic to a better place and implement it so we can configure it in the scene
- Fixed bug with the resolution of the viewport and the scale.

…r android