Fix build error in sample ref-types and wasm-c-api caused by the
version of wat2wasm: refine makefile to auto detect the wat2wasm
version and add the compile flag accordingly.
Implement more wasm-c-api APIs to support Envoy integration:
- sync up with latest c-api definition
- change CMakeLists to export necessary headers and install the static library of iwasm
- enable to export tables and memories
- support memorytype and tabletype APIs
- update wasm-c-api sampels
- enable to export importtype APIs
And refine bazel scripts for sample XNNPACK workload, add license headers for sample simple.
Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>
