* add x86-wasm.cmake to community triplets
The EMSDK enviroment variable is normally defined when first installing Emscripten.
* Rename x86-wasm.cmake to wasm32-emscripten.cmake
* Update wasm32-emscripten.cmake
* Update wasm32-emscripten.cmake
* Add wasm32 and wasm64 arch to docs
* Create wasm64-emscripten.cmake
* remove wasm64
* Delete wasm64-emscripten.cmake
* Add wasm32 to list of identifiers
* add emscripten VCPKG_CMAKE_SYSTEM_NAME support
* add path check to EMSDK cmake toolchain
