Store the floating size of each client in the window manager's client metadata.
Remove client window metadata upon destruction.
WindowLayouts are now stateless.
Updated Dynamic_WindowManager's binding actuators to use the new stateless window layouts.
Updated the RaiseFloating binding actuator.
Renamed Move/Resize_BindingActuator to Mouse_Move/Resize_BindingActuator to make room for Keyboard_Move/Resize_BindingActuator in the future.