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.

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

• rectangle
• line
• fillers

Quickly tested with ad-hoc temporary hacks in framebox:

• ellipse
• circle
• arc

Untested:

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