Add an in game stage Minimap to the screen#208

Much like in Smash Ultimate, a small minimap in the corner of the screen (which would be toggleable of course) after a player is sent off the visible screen would be very helpful to show either how close you are to dying, or where you even are relative to the stage.

Considering how long offstage interactions can last in Rivals, it would be helpful to know where I actually am in a scramble situation or if my opponent is committing hard to an edgeguard at the bottom of the screen.