Support sprites

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](https://en.wikipedia.org/wiki/Nearest_neighbour_algorithm) is enough for now.

Start by reading the coordinates-system module and tracing how sprite placement relates to the canvas and scene resolution. Clarify the scaling-area representation and verify that nearest-neighbour scaling handles both enlarging and shrinking sprites. Done means sprites fit the scene resolution using the agreed scaling behavior.

Written by the indexing model from the issue text.