Fixed CJK characters not rendering in new Label Engine [sc-24364]

[uberbrady]

This is a surprisingly hard problem to solve for some reason I don't fully understand. But because the new Label rendering engine actually generates PDF's based on fonts that are installed as part of the TCPDF library, not just rendering web pages.

So this solution - while terrible - is an approach that will, in the end, solve the problem. It presents two additional drop-down selects in the Label engine settings, defaulting them to what the current font choices are. There's one for your choice of fixed-width font, and one for your variable-width font. In there, if you pick 'cid0cs' as your font, they will render correctly, for Simplified Chinese. Similarly you can use 'cid0ct' for Traditional Chinese, 'cid0jp' for Japanese, and 'cid0kr' for Korean. (Lovely font names by the way; very intuitive).

There are a ton of other fonts available as well, so for now I've included them all. If we decide to go another way on this - possibly auto-detecting characters from different languages, or something else - we can change it - possibly just showing 'useful' subsets, or maybe doing something else entirely.

But this already is useful because you can quickly test out different font choices and see how the characters render when you do. Additionally, if you 'import' a new font, it should show up on the list (as it's dynamically generated). So if we find new fonts to play with, we can at least try them out.

I have not added the additional translation strings yet because we aren't even convinced we're going to go in this direction. If we do decide to go with this approach, I'll need to get all of those translation strings set up. (Interestingly, we can recommend different font choices for different languages, maybe? Or maybe that's the trick - the fonts you get are based on the language you're configured for? Not sure.)

[shortcut-integration]

This pull request has been linked to Shortcut Story #24364: Asian (possibly more) characters don't display on labels.

[what-the-diff]

PR Summary

• Enhanced Settings
  The addition of use TCPDF_FONTS and $fontlist in the getLabels method offers a wider range of font options in the Settings Controller.
• Improved Label Functionality
  The integration of label2_mono_font and label2_variable_font in the postLabels method have expanded the font capabilities for labels.
• Updated Label Abstract Class
  The inclusion of $variable_font and $mono_font properties improves the versatility of the Label class.
• Adapted Write Method in DefaultLabel Class and Other Sheet Classes
  By adding $this->variable_font and $this->mono_font to the write method of the DefaultLabel class and the multiple sheet classes (L7162_A.php, L7162_B.php, L7163_A.php, _5267_A.php, _5520_A.php, TZe_12mm_A.php, TZe_24mm_A.php, LabelWriter_30252.php), variable and mono fonts can now be used more effectively.
• Migration File Addition
  The new migration file, 2024_02_08_165209_add_fonts_to_settings.php, updates the database schema to include this expanded font selection.
• Enhancement of Font Options Interface
  The changes in resources/views/settings/labels.blade.php deliver an improved user interface that includes font options for variable-width and fixed-width fonts, adding to the flexibility and ease of customization for end users.

[snipe]

I hate this solution, but I hate literally everything else we've talked through more :(

[snipe]

@uberbrady this has conflicts now - do we maybe want to re-target this to v7?

[uberbrady]

Although it's designed to be a non-breaking change - yes, I think retargeting it is probably a smart move. "But it's a non-breaking change!" is probably how most laments begin.