Add a new setting to MoveBlockRedirects that is applied when the speed multiplier is set to 0, which "pauses" the moveblock by either resetting or removing the Controller coroutine.

An option can be added to the map plugin to choose between the behaviours, and a visual indicator will be added to show whether the moveblock can restart or not.

• If it cannot be restarted, the arrow texture on the MoveBlock should be removed

The texture of the MoveBlockRedirect should show a "Pause" icon (:pause_button:) when this setting is applied.

Requested by @vitellaryjr