v5.2.12

[alexrp]

• Added support for wasi-wasm.
  • Note that there is no support for building static libraries yet.
• Added a NoEntryPoint property to allow building executables without an entry point.
• Added an ExecutionModel property to control the execution model for WebAssembly executables (Command or Reactor).
• Fixed QEMU detection to use qemu-ppc64le instead of qemu-ppc64.
• Added support for using Wasmtime as a WebAssembly emulator.