- Move all demo projects that don't require Forward+/Mobile-only features
to the Compatibility rendering method. This improves performance significantly
on low-end devices and ensures visuals are identical to a web export
of the demo.
- Set deadzone on all inputs to 0.2 for better gamepad usability.
- Remove reliance on `default_env.tres` to use built-in Environment
resources in the main scene instead (which follows the preview environment
workflow).
- Remove notices pointing to GDNative or VisualScript, since both were
removed in 4.0.
- Various bug fixes and usability tweaks to 10+ demos.
