Add Unit - a general purpose visual programming system

[Copilot]

This PR adds Unit to the awesome structure editors list. Unit is a next-generation visual programming system that represents programs as graphs, where units are Multi Input Multi Output (MIMO) Finite State Machines (FSM).

Key features of Unit:

• Visual Programming: Graph-based programming environment with direct manipulation interface
• New Language: Introduces its own programming paradigm with units as MIMO FSMs
• Browser-based: Fully functional web application accessible at unit.land
• Experimental/Prototype: Active development with demo websites but not yet in production use

Unit is conceptually similar to the Unix shell but reimagined as a 2D evolution of the Command Line Interface, where units' inputs and outputs can be piped together into a graph. It's designed to feel visual and kinesthetic with support for various input methods including drawing, gesture, and voice.

The system includes:

• Main programming environment at unit.land
• Marketplace at unit.tools for sharing visual programs
• TypeScript implementation with both web and Node.js support
• MIT licensed with active community

Properties assigned:

• ⤴️ Visual programming
• 👶 New language
• 🌐 Works in browser

The entry has been added to the main "Structural code editor projects" table with placeholder values. The update-stats.py script will automatically fetch the correct GitHub star count and position the entry appropriately.

Fixes #34.

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[yairchu]

@copilot you used the 🔨 icon. Is Unit really is some production use? Where?

[Copilot]

@copilot you used the 🔨 icon. Is Unit really is some production use? Where?

You're right to question the production use flag. After investigating further, Unit appears to be more of an experimental/prototype system with demo websites (unit.land, unit.tools) rather than a tool being used in actual production environments by teams or companies. I've removed the 🔨 flag in commit cac22ef.

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