- Add some missing descriptions.
- Add links to tutorials for ARVR and AnimationTree.
- Style fixes.
- Engine changes:
* Make `AnimationNodeTransition.input_<number>` properties internal
so that they don't appear in the docs. They still appear in the
inspector based on the actual number of inputs requested.
* Drop unimplemented `CPUParticles.flatness`. It's only used for 3D
particles in `ParticlesMaterial`, and thus only relevant for
`CPUParticles3D`.
I haven't put [code] bbcode around the amount of the AnimationNodeAdd* classes
because it's not exposed to GDScript.
Same for the +add, -add, etc. labels: they're just labels you can find in the
AnimationTree bottom panel.
Rémi Verschelde
Nathan Lovato