feat: Support more rough features

[Omikhleia]

More features from roughjs ported to Lua and more options to \roughbox:

I started this some time ago and thought I lost it. Just recovered it, so let's save it in a branch.

Unfinished, with FIXME comments -- And perhaps regressions / mistakes. I guess the idea was eventually to extract the rough-lua part as a standalone rock.

• [x] Initial recovered version (refactored + many fillers)
• [x] Missing filler zigzag-line
• [x] JS shims refactor
• [x] Missing code for arcs, ellipses, circles + test
• [x] Missing code for SVG paths + curves on points = partial, see note
• [x] Clean-up

Note: Partial port only for SVG paths and curves on points, they use two additional modules (points-on-curve, path-data-parser) which I have ported, but not tested. So I left them out The feature is not needed in my current use case... Let's have them in an "untested" folder for now.

[Omikhleia]

Seems it was quite working --

So surely finishing and reviewing the port would be cool.

[Omikhleia]

Things should be ready for possibly extracting prng-prirogin and rough-lua as separate Lua rocks. No doing it here yet, though -- it's easier for now to have everything at hand if I need to make last minute adjustments.

[Omikhleia]

Tested, as used by framebox:

• [x] rectangle
• [x] line
• [x] fillers

Quickly tested with ad-hoc temporary hacks in framebox:

• [x] ellipse
• [x] circle
• [x] arc

Untested:

• curve (from points)
• path (from SVG)
• the dependencies of these (= 2 untested module folders)