Add canvas for minimap

[Cazka]

I would like to have the ability to draw on the minimap using CanvasAPI.

 MinimapCanvas.getCanvas()

the canvas should have the dimensions of the arena so we dont have to convert the coordinates.

[Cazka]

this function will translate arenaPosition to canvasPosition so that it will be inside the minimap

function toMinimapPosition(vector) {
    const unscale = diepAPI.arena.unscale(vector);

    const minimapPos = diepAPI.Vector.multiply(diepAPI.minimap.minimapDim, unscale);

    return diepAPI.Vector.add(diepAPI.minimap.minimapPos, minimapPos);
}