Depth / render queue hadling for line (2d drawing)

[julioobelleiro]

When using 2 coordinates it is rendered on the canvas, so it will always be background (non visible when there are other elements blocking it).

When it uses 3 coordinates, the render queue is fixed and doesn't seen to work right (test it for example drawing another image in full screen and it won't be visibie - the 2d lines - )