Support sprites

[imbrn]

For this issue, we must consider scaling up/down images as the sprites should fit into the canvas based on the scene resolution. For this reason, maybe it's important to define a way for scaling areas using the coordinates-system module.

Also, at this first version, we shouldn´t worry about offering a lot of algorithms for scaling up/down images, but I think using the Nearest Neighbour Algorithm is enough for now.