Xterm.js Option

[JeffersGlass]

Adds a new options xterm to <py-config>, which defaults to false. If xterm is true, the xterm.js package is dynamically loaded and used as py-terminal, in place of the default <pre>-tag-with-formatting. This is ~400kb of additional transfer, so xterm.js is only fetched if this option is enabled.

This PR is ready for review

This PR is a Work in Progress. To-do list is:

• Get Xterm working as py-terminal
• Enable screen reader mode by default for accessibility
• Rebase following Syncify PR Merge
• Investigate better typing for modules loaded from URL
• Investigate xterm's auto-sizing function to make sure there are no hidden issues rendering on page load Auto-fit addon is pretty buggy, not going to include it
• Think about setting some options in os.environ to make common Python terminal utilities work "out of the box"
  • Not sure if these options should be set by default, or documented as recommended things for users to do themselves. Leaning toward the latter.
  • Termcolor
  • Colorama (works with no additional config)
  • Rich - Need to set rich._console = RichConsole(color_system="...")
  • curses not built/bundled with Pyodide
• New Tests
• Add parameter validation once Improve validate() function for plugin options #1323 is merged
• Documentation
• Changelog

[JeffersGlass]

I noted this over there was well, but I want to include the functionality from #1323 in this, so prioritizing that PR for the moment.

[JeffersGlass]

test_simple_clock failed, but certainly passes locally... very odd.

[JeffersGlass]

Thank you so much for all the comments/notes @WebReflection ! I've addressed most of them, but the ones around the general approach using the CDN as well as guarding against what happens when a node gets moved around I've not yet addressed, so we can continue conversation on them.

[WebReflection]

@JeffersGlass no problem and, if needed, I can help resolving pyscriptjs/src/plugins/pyterminal.ts as that's "on me" but if you don't find particular issues go ahead 👍

[WebReflection]

@JeffersGlass it looks like there are too many unrelated files in here ... are you tackling the rebase or do you need any help with that?

[JeffersGlass]

@WebReflection Yeah it looks like I screwed up the merge from main - just remerged (including the PR's from earlier today), it's back down to a much more reasonable 7 files changed. Haven't looked at your other responses yet, but I appreciate them!

[WebReflection]

@JeffersGlass few comments / nits you can freely ignore if you think my opinion is not so relevant, otherwise this LGTM and thanks for working on it, it looks awesome!

[JeffersGlass]

Thanks all! And especially thanks to you @WebReflection for the many rounds of revision and review, and really helping shape the API and naming of this.