A simple mod that adds blocks that render the sky (or an end portal)

What we want, not necessarily what we have

• Optifine: no. never.
• Sodium / Rubidium: Full compatibility
• Iris / Oculus: Basic support (no crashing, works when shaders are not enabled)
  • Support when using shaders is harder, so it's not a goal for me. I would accept PRs though.

This is a 1.19.2(+) port of Literal Sky Block originally found at https://github.com/nanite/Literal-Sky-Block. Some code from the fabric port also used, which can be found at https://github.com/Gaming32/literal-sky-block-fabric/. Both of these projects are licensed under LGPL-3.0.