Add support for drawing points

[joseluis]

Hi! Testing notan I missed being able to draw points in a simple way with variable width and alignment, so I created a Point shape, and two enums for alignment, since it didn't seem appropriate to reuse the ones intended for text.

I also made an example showcasing all the alignment combinations on the first 10 integral widths, showing labels when compiled with text support:

Please feel free of letting me know if you want me to change something.

[Nazariglez]

This looks good to me, a great addition. Thanks you so much!