Physically move windows only when they're visible.
Use the GeometryChange system to hide windows instead of configuring them directly.
Implemented the layout-exempt set of clients in Tag.
Added an UpdateClientWindow to the TagManager.
Implemented the ToggleFloating binding actuator.
Send a configure notify event to windows we resize/reposition.
Added some stacking order management methods and used them in float toggling.
Raise new floating clients.