Rust rewrite

[sharkdp]

This is a complete rewrite of the Yinsh implementation in Rust, using the Bevy game engine. I'm doing this for multiple reasons:

1. I can not modify the current frontend anymore since it was written in Haste and that language has since been abandoned. I didn't even manage to compile it with an old compiler last time I tried.
2. I wanted a version of the game without a backend. No need for an extra server. The game can now run on the user PC (either natively or in the browser)
3. I wanted to have animations in the frontend.
4. I want to be able to optimize the performance of the game, in order to make the AI more powerful.

To do:

• Scale grid for smaller/larger monitors
• Nicer graphics
• WASM version
• Check if (ring removal) works if opponent creates run for you
• https://bevy-cheatbook.github.io/platforms/wasm/size-opt.html
• Touch support
• Remove information display / make nicer
• Indicator for ring removal
• History (undo, redo, load-from-file) implementation
• Detect draws
• Sounds(?)
• Settings:
  • AI strength
  • Theme
  • Information display (what kind of information should be shown?)
  • Fullscreen/windowed
• AI
  • Still seems to play extremely weak in some situations.
  • Add heuristic for ring moves
  • Compute both marker placement + ring move in one go (compute principal variation and take action 1 and 3, if 2 is a wait-action for the human player)
  • Search in two different depths? One for immediate threats, one for general gameplay with a more expensive heuristic.
• Choose playing mode (human-AI, AI-human, human-human, AI-AI)
• Cool AI features (tutorial mode; get notified when making blunders)
• New README

Issues

• closes seeing opponent's moves #1
• closes Rings that cannot be moved #2
• closes Indefinite hang when blue player creates third five-in-a-row for green #6
• closes Resurrect the frontend code #8
• closes Undo-functionality #4
• closes Canvas drawing is blurry (on macOS Safari) #9
• closes View history of the game without keyboard #10
• closes Offline version #13

Eye candy