Draft: [1.20.4] Many API Additions

[hammy275]

A 1.20.4 port of #184 . This also adds a couple of new changes:

• Moved isVanillaRenderPass() to the bottom of the file, since its still marked @Beta. Perhaps we want to make a VivecraftRenderingAPI or something, just for organization?
• Added isFirstRenderPass() and getCurrentRenderPass(), as requested.

All features can be tested with this test mod. Note that the test mod itself has only been tested on Fabric, but should work in Forge.

[hammy275]

Rebased onto Multiloader-1.20.4. Haven't tested it, but there were only a handful of merge conflicts with very simple fixes for all of them. Should be good to test with the test mod linked above.

Unrelated, but if it makes life easier, I'm happy to rebase this after #284 is merged.

[hammy275]

Change this to be isLeftHanded() and update the javadoc accordingly.

[hammy275]

This PR is now caught up with the big refactor, but is untested. That said, I've marked it as draft, as there's several changes I'd like to make, and because the catching up to the refactor is entirely untested beyond ensuring it builds. These changes include:

• The renaming of reversed hands to left-handedness
• Refactoring to not have two versions of VRData and VRDataImpl. Ideally, just the interface and the class should exist, without needing to do internal conversions for the API.
• Rename ClientAPIImpl and APIImpl to VivecraftClientAPIImpl and VivecraftAPIImpl.
• Move rendering stuff out of the client API and into a "rendering API" area.
• Move haptic pulse triggering into VRPlayer, since it makes sense that once you have a VRPlayer, you should be able to trigger a haptic pulse on it.
• FBT support once merged.
• Update demo mod to include the above changes.

[hammy275]

Squashed everything into one commit for now to make rebasing less annoying and now rebased on top of the JOML changes. Still need to test and make the changes above, but that should happen soon.