Add a isometric view using a different library meant for 2D to allow easier playability strategy style in phones with smaller screens

[abhijitnandy2011]

We can allow switching of the camera angle at most between fixed 45 degree angles, but the view remains isometric - this can support phones easily and we do not need to use a large library like BabylonJS yet get a quasi-3D view. Also we can have very good art quality like AoK but not lose fps possibly exceeding 3D rendering capabilities of WebGL