Allow for initialization of projectile/NecromancerSquare without AbstractShape reference

[ABCxFF]

export default class NecromancerSquare extends Drone {
    public constructor(barrel: Barrel, tank: BarrelBase, tankDefinition: TankDefinition | null, shootAngle: number, shape: AbstractShape) {

this is preventing people from using necro drones as a bullet type - since they require a shape parameter.

[Nul-led]

Can't we just expose a seperate method setShape and use the default square in the ctor?

[ABCxFF]

That'd be fine too - could also use like a static method NecromancerSquare.fromShape() - either or : shrug:

[Nul-led]

yea fromShape is easier access, let's do that