Add support for Wa language

[chai2010]

Wa is a general-purpose programming language designed for developing robustness and maintainability WebAssembly software. Instead of requiring complex toolchains to set up, you can simply go install it - or run it in a browser.

https://github.com/wa-lang/wa

The wa languge support build wasm4 gmae, there are some examples:

• https://wa-lang.org/wa/w4-2048/
• https://wa-lang.org/wa/w4-life/
• https://wa-lang.org/wa/w4-magnifying-glass/
• https://wa-lang.org/wa/w4-pong/
• https://wa-lang.org/wa/w4-snake/
• https://wa-lang.org/wa/w4-tetris/
• https://wa-lang.org/wa/w4-tic-tac-toe/

Source code:

• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-2048
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-life
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-magnifying-glass
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-pong
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-snake
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-tetris
• https://github.com/wa-lang/wa/tree/master/waroot/examples/w4-tic-tac-toe