CanvasItemEditor:
- p_result == ADD_MOVE is always true in this switch-clause
- both parts of the if-else-clause do the same thing and simplified an affine_inverse call
ControlEditorToolbar:
- private function ControlEditorToolbar::_anchor_to_position is used nowhere. Looks like
copy and paste from CanvasItemEditor::_anchor_to_position
ScrollContainer:
- screen_is_touchscreen is always true, because otherwise the function already returned
TextLine:
- both parts of the if-else-clause do the same thing and simplified return statement
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).
Removes some unnecessary includes from `editor_node.h`, and instead add
those where they're used.
Removes unnecessary `editor_node.h` includes in various editor classes.
Renames `dynamicfont` to `dynamic_font` in a couple files.
Misc cleanup while jumping through that rabbit hole.
