Using this command:
```
find -name "thirdparty" -prune -o -name "*.h" -exec sed -i {} -e '/return /! s/\t\([A-Za-z0-9_]* \*[A-Za-z0-9_]*\)\;/\t\1 = nullptr;/g' \;
```
And then reviewing the changes manually to discard the ones that don't
seem correct/safe/good (notably changes to `core` unions).
- Rename RayCast2DEditorPlugin to Cast2DEditorPlugin and make it also support editing ShapeCast2D.
- Apply RayCast2D debug drawing improvements from #46675 to ShapeCast2D.