New Ruler generator ruler.py

[linuxras]

I was recently in need of cutting and engraving some rulers of different sizes.
As a result I went looking a some kind of generator a I thought it would be the perfect thing to fit my let the computer do that math philosophy vs doing a bunch of CAD.
So i started with bazel and came up with a generator that fit the bill for me, I hope its useful to others as well.

One caveat is the ruler text on the display does not match the actually font, maybe someone can fix that part up.

This is part of my pull request.
Happy CNCing