Create isometric shader

[justgook]

Tiled have isometric maps, so we need way to render them:

https://gamedevelopment.tutsplus.com/tutorials/isometric-depth-sorting-for-moving-platforms--cms-30226

https://gamedevelopment.tutsplus.com/tutorials/creating-isometric-worlds-a-primer-for-game-developers--gamedev-6511
Magic functions:

//Cartesian to isometric: 
isoX = cartX - cartY;
isoY = (cartX + cartY) / 2;

//Isometric to Cartesian:
cartX = (2 * isoY + isoX) / 2;
cartY = (2 * isoY - isoX) / 2;