Update RoomVisual.poly to also accept positions

[Dessix]

From the documentation:

points | array | An array of points.
Every item should be either an array with 2 numbers (i.e. [10,15]), or a RoomPosition object.

[kotarou]

Verified that the PR works.

This misses one example of poly usage, which is also the example given in the screeps documentation - using an array of objects that contain x and y properties (e.g. a path).

Recommend changing to poly(points: Array<{x:number, y:number} | [number, number] | RoomPosition>, style?: PolyStyle): RoomVisual; or equivalent.

[Dessix]

The changes I've pushed allow objects meeting the { x: number, y: number } structural interface to be used in place of RoomPosition instances. I've tested these as working. This also changes RoomVisual's constructor to the Typescript standard es6 declaration style, wherein the constructor and instance types are separate interfaces, and provides separate subtypes for differentiating the availability of roomName depending on whether or not the "global" constructor was used.

[kotarou]

Visually looks really good to me. Will explicitly test on prod scripts and check soon.

[thaelina]

I tested these changes and was unable to declare a RoomVisual
Error:(39, 19) TS2693:'RoomVisual' only refers to a type, but is being used as a value here.
let vis = new RoomVisual();

Need to add declare const RoomVisual: RoomVisualConstructor;

I know this has been languishing here, but hopefully we can get this repo updated and such

[Dessix]

Added constructor object instance for RoomVisual as per @thaelina's suggestion and rebuilt.