refactored edit policies and commands, some clean up

...oling/base/ui/command/ChangeBoundsRequestCommandBase.java

...fortiss/tooling/base/ui/command/MoveConnectorCommand.java

...iss/tooling/base/ui/command/MoveWithinDiagramCommand.java

...ng/base/ui/compose/ConnectorConnectionCompositorBase.java

...rtiss/tooling/base/ui/editpart/ConnectorEditPartBase.java

...fortiss/tooling/base/ui/editpart/DiagramEditPartBase.java

...fortiss/tooling/base/ui/editpart/ElementEditPartBase.java

...s/tooling/base/ui/editpart/FreeConnectorEditPartBase.java

...tooling/base/ui/editpart/StickyConnectorEditPartBase.java

...ase/ui/editpart/policy/ConnectionBendpointEditPolicy.java

...ui/editpart/policy/ConnectionGraphicalNodeEditPolicy.java

...ui/editpart/policy/ConstrainedNonResizableEditPolicy.java

...ling/base/ui/editpart/policy/DiagramLayoutEditPolicy.java

...ling/base/ui/editpart/policy/ElementLayoutEditPolicy.java

...ling/base/ui/editpart/policy/FreeResizableEditPolicy.java

...tooling/base/ui/editpart/policy/LayoutEditPolicyBase.java

...iss/tooling/base/ui/editpart/policy/RemoveEditPolicy.java

...rtiss/tooling/base/ui/layout/util/EllipseLayoutUtils.java

.../fortiss/tooling/base/ui/layout/util/LayoutDataUtils.java

...iss/tooling/base/ui/layout/util/RectangleLayoutUtils.java