This makes it easier to spot syntax errors when editing the
class reference. The schema is referenced locally so validation
can still work offline.
Each class XML's schema conformance is also checked on GitHub Actions.
This provides better usability when a GradientTexture or CurveTexture
is added to a Control node.
Visual appearance of most GradientTextures and CurveTextures will
be unaffected.
* This was required by users in some scenarios, such as animating individual axes over time with a single texture.
* Examples: Shaders, Particles, etc.
* CurveTexture now defaults to RGB, can be changed to Red if needed, this allows to freely exchange them.
Lots of internal API changes and some docstrings were lost in the conversion.
I manually salvaged many of them but for all the rendering-related ones, an
additional pass is needed.
Added missing enum bindings in BaseMaterial3D and VisualServer.
We already removed it from the online docs with #35132.
Currently it can only be "Built-In Types" (Variant types) or "Core"
(everything else), which is of limited use.
We might also want to consider dropping it from `ClassDB` altogether
in Godot 4.0.
