Add die faces and a bunch of arrows (ref #68)

[RubenVerg]

Most are used in Uiua, the remaining ones were trivially created from the Uiua ones.

[RubenVerg]

oh, sorry, we already had the first two, but the arrow head looked weird

[abrudz]

1. I think the "tails" of ⤚⤙ look too thin, especially for what Uiua does with them. Better make the horizontals stroke into normal strokes, like a merged >- and -<.
2. Do the double-harpoons have normal horizontal stroke width? Compare with =.
3. I think the dashed arrows could do with no partial dash connected to the head and instead spreading the dashes a bit more.
4. The die face squares look too thick.

[RubenVerg]

1. They're reversed arrowheads, I think that makes the most sense (mnemonics for what they do are usually stated in terms of arrows)
2. They were supposed to be the same thickness as arrows, but something went wrong, thanks for spotting it
3. Sure
4. They're the same squares used everywhere else, they end up looking thick because the dots have to be smaller than the usual ones to be able to fit six. I don't think there's a good solution; making the square thinner makes them obviously clash. The smaller dot in the same square is is how it's done in Uiua386 as well, fwiw:

[abrudz]

4. Could all the squares be grown? Make them the same width as ⎕. That'll relax a lot of the squares with content.

[RubenVerg]

Not sure, you want the things inside to touch the borders or e.g. ⊞ for outer product in Uiua and TinyAPL doesn't really make sense anymore

[RubenVerg]

though I guess circles are quad-wide and ⊕ looks good enough

[RubenVerg]

also squares aren't really square, i think they were built off the ⊐ glyph which isn't really necessary

[abrudz]

Right, making them consistent with the circles is good, methinks.