Changes

[443954] Fix listener were not properly unregistered within VCL.

- Fixed visual change listener did not remove all listeners within
unregister().

[443954] Invert y-axis of Dot by default (so we obtain proper coords).

[443954] Fix routers do not properly respect coordinate systems.

- Fixed StraightRouter and OrthogonalRouter did not properly compute AnchoredReferencePoint
within the coordinate system of the anchored, which is the Connection's
curve node.

[443954] Ensure connection refreshes on hint changes.

[443954] Ensure interpolator uses updated start and end points.

- Ensured interpolator does not skip in case of empty geometry and
updates decorations based on computed geometry.

[443954] Ensure listener registration is appropriate within Connection.

- Fixed transform listener was not properly registered on new curve
node.
- Added a layout bounds listener to the curve node (to trigger a refresh
on the connection).

[443954] Add proper translation to AnchorageReferencePoint.

- Ensure AnchorageReferencePoint is specified within coordinate system
of anchored.

[443954] Refactor GeometryNode to be specific Region instead of Parent.

- Refactor GeometryNode to extend Region, rather than Parent, so the deprecated impl_calculateLayoutBounds() no longer has to be overwritten. The contract is now that the geometry reflects the geometric size and position (in parent coordinates). That is, the GeometryNode is relocated and resized when the geometry is changed. Clients can now use relocate and resize to manipulate the visual bounds as well as relocateGeometry/resizeGeometry to manipulate the geometric bounds. The GeometryNode will listen to stroke type and width changes and will update the visual bounds.
- Added tests to guarantee proper behavior.
- Made NodeUtils robust against GeometryNodes with no geometry.
- Ensured that feedback geometry is properly translated to parent coordinates within FXSelectionFeedbackPart, FXHoverFeedbackPart, and FXFocusFeedbackPart.

[443954] Enhance ConnectionSnippet to use orthogonal router.

- Ensured that one edge uses orthogonal routing for demonstration
purposes.

[NONE] Update image sources for GEF4 Common.