Squared variants of some characters

[properly-strawberry]

• The requested variant shape does not go too far away from Iosevka's design.
• The requested variant does not conflict with any characters in Unicode that Iosevka currently supports.
• For each variant you requested, there are at least two monospace/programming fonts created by different designers supported the requested variant. Provide images below.

Berkeley Mono

Profont

Share Tech Mono

Terminus

---

Some technical-style fonts provide squared interpretations of certain characters like six, nine, at symbol, upper case and lower case O, U, S. Added more examples as what they might look like, primary inspiration for this request was Berkeley Mono. It doesn't seemt to stray away too far from current Iosevka style and adds certain flare.

[Logo121]

This is an entire style change, requiring a modification on how the arcs work in general. (Related: #622)

The best one can do is probably to override some metrics (e.g. ArchDepth/SmallArchDepth), though it probably doesn't get you very far.

[properly-strawberry]

This is an entire style change, requiring a modification on how the arcs work in general. (Related: #622)

The best one can do is probably to override some metrics (e.g. ArchDepth/SmallArchDepth), though it probably doesn't get you very far.

I thought it might be a bit too much, it's fine if it is.