Initial VR scene for main menu
https://files.facepunch.com/alexguthrie/1b2011b1/sbox_pKFaTyqkgq.png
UI: Fix worldpanel depth issues, treat worldpanel roots as layers
Render VR menu at 4k, scale down to fit
Basic VR world input component, menu works properly
https://files.facepunch.com/alexguthrie/1b2511b1/Desktop%202024.06.25%20-%2015.51.37.05.mp4
Line hands up better in VR menu scene
Quick little test map just so I'm not staring at an orange texture