Add registration of libc-wasi to 'wasi_snapshot_preview1' to support cargo-wasi
change zephyr build method from cmake to west
fix problem when preserve space for local vars
fix wasi authority problem
* Add printingAdd print time for wamrc, fix posix mmap bug time for wamrc, fixed a posix mmap bug.
Change-Id: Ib6517b8a69cf022a1a6a74efa1f98155aec143bc
* Add a basic sample to show how native runtime invokes wasm app in WAMR, and how wasm app invokes native functions.
Change-Id: I700ae413ad5e9ea04540d5187952305e1ee92d73