NavMesh pathfinding extension

To update the library:

• Clone this fork https://github.com/D8H/recast-navigation-js
• Check out main
• Get the wasm build with npm
• Copy the wasm build into recast-navigation-js/packages/recast-navigation-wasm/build
• Run yarn build
• Check out umd-build
• Run yarn build
• Copy recast-navigation-js/packages/recast-navigation/recast-navigation-generators.js and the wasm build into this folder