FurryR/xterm: add extension

[FurryR]

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Features

• appearance: adjust theme / font size / xterm.js features / etc. Transparency colors are supported (buggy, input buffer settings also affects input).
• input: handle raw / buffered input in your game / application. Support almost all keys and even multi-byte inputs such as Japanese.
• output: print colored texts, and it is just enough.
• events: handle mouse events. Useful when programming advanced console applications / games.
• utility: things that might help the development or migration of your application.

Additional information

• Input buffer / web link / ligatures / mouse events are disabled in default, although they might be useful.
• cursor wrapper once saves your cursor position, executes the branch, then restores the cursor position when the code finishes. It is useful when drawing windows.
• Positions are zero-based. x stands for column, y stands for row.
• It may requires an extra extension to deal with JSON event data.

Notice

Please do not publish Gandi IDE projects with this extension before it gets merged / closed by Turbowarp (alternatively, use Gandi Terminal). Please do not publish the extension on Gandi asset store. You can still try the extension on Gandi IDE.

Please ask for my confirmation before you port this extension to Gandi IDE.

Example project (migrated)

Modified version of Linux 6.1.14-rv32ima On Scratch by bilman66, provides a way better serial input/output system.

[FurryR]

For approval please check 81b115b instead of d2cdf69.

[FurryR]

This extension's kinda over-complicated but who cares?

[FurryR]

All blocks preview

[unknown07724]

this is basically python but it uses javascript

[FurryR]

This extension requires #1591 to be merged. Now its marked as draft.

[FurryR]

Well, it seems that #1559 is impossible to be merged. I will just open this PR again.

[yuri-kiss]

Please remind me to review this when I have time 🙏