Note: Only replaced 2 instances to test, Node.get_children and TileMap.get_used_cells
Note: Will do a mass replace on later PRs of whathever I can find, but probably need
a tool to grep through doc.
Warning: Mono will break, needs to be fixed (and so do TypeScript and NativeScript, need to ask respective maintainers)
This doesn't make much sense API-wise, but it's important for the documentation
workflow that the Mono and non-Mono builds produce the same output, otherwise
we keep having non-Mono builds removing Mono properties and losing their
descriptions.
This is a terrible hack but it's ad hoc, and should be OK for the time being.
Now that the unused DocDump was removed, the `editor/doc` subfolder is
redundant.
Similarly, there's no reason for Collada to have a subfolder for itself
when glTF or OBJ don't.
