Implement collisions for partial map objects

[MyMarvel]

We have partial objects like IronWallRight or StoneWallBottom for example, and there is no collision shape for them at all. We have to add it, and this shape should start not from the center of the object (I don't know how to do it yet).

[lewiszlw]

Maybe we could create another collider entity as the child of IronWallRight entity.