Take the style from the filename if it's longer than the subfamily (fixes #257)

[duganchen]

The font patcher now takes the style ("Italic", "Regular", etc) from the filename if it's longer (contains more information) than the "subfamily".

Description

Updates the font patcher's algorithm for detecting the style (Italic, Regular, etc) in the font's Postscript name, so that it's more accurate.

When I first tested this with IBM Plex Mono 5.3.1, I could confirm that it fixes fixes #257 by successfully giving each generated font a unique Postscript name.

I have since tested it with VictorMono and JetBrainsMono. I have also imported all three into Font Book on OS X, and confirmed that this pull request does, indeed, resolve the issue.

Requirements / Checklist

• Read the Contributing Guidelines
• Read or at least glanced at the FAQ
• Read or at least glanced at the Wiki
• Scripts execute without error (if necessary):
  • If any of the scripts were modified they have been tested and execute without error, e.g.:
    • ./font-patcher Inconsolata.otf --fontawesome --octicons --pomicons
    • ./gotta-patch-em-all-font-patcher\!.sh Hermit
• Extended the README and documentation if necessary, e.g. You added a new font please update the table

What does this Pull Request (PR) do?

Fixes #257.

How should this be manually tested?

The literal command I used to test this is in my comment here:

#323 (comment)

After that, I did "fc-cache -f -v" and "kitty list-fonts --psnames", checking that each Blex Mono font file's Postscript name is unique.

Any background context you can provide?

I tested the font patcher on Fedora 32. I tested the results on Fedora 32 and on OS X.

What are the relevant tickets (if any)?

#257

[ryanoasis]

typo change, other comment is open ended question. Thanks for taking on this fix...

[duganchen]

You know, I did fix the typo...

[ryanoasis]

Thanks!