Implement more wasm-c-apis and enable Envoy integration (#622)

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>

samples/wasm-c-api/src/callback.c

@@ -4,14 +4,6 @@
 #include <inttypes.h>
 
 #include "wasm_c_api.h"
-#include "wasm_export.h"
-#include "bh_platform.h"
-
-extern bool
-reader(const char *module_name, uint8 **p_buffer, uint32 *p_size);
-
-extern void
-destroyer(uint8 *buffer, uint32 size);
 
 #define own
 
@@ -69,8 +61,6 @@ own wasm_trap_t* closure_callback(
 
 
 int main(int argc, const char* argv[]) {
-  wasm_runtime_set_module_reader(reader, destroyer);
-
   // Initialize.
   printf("Initializing...\n");
   wasm_engine_t* engine = wasm_engine_new();
@@ -78,11 +68,7 @@ int main(int argc, const char* argv[]) {
 
   // Load binary.
   printf("Loading binary...\n");
-#if WASM_ENABLE_AOT != 0 && WASM_ENABLE_INTERP == 0
-  FILE* file = fopen("callback.aot", "rb");
-#else
   FILE* file = fopen("callback.wasm", "rb");
-#endif
   if (!file) {
     printf("> Error loading module!\n");
     return 1;
@@ -154,12 +140,8 @@ int main(int argc, const char* argv[]) {
 
   // Call.
   printf("Calling export...\n");
-  wasm_val_t args[2];
-  args[0].kind = WASM_I32;
-  args[0].of.i32 = 3;
-  args[1].kind = WASM_I32;
-  args[1].of.i32 = 4;
-  wasm_val_t results[1];
+  wasm_val_t args[2] = { WASM_I32_VAL(3), WASM_I32_VAL(4) };
+  wasm_val_t results[1] = { WASM_INIT_VAL };
   if (wasm_func_call(run_func, args, results)) {
     printf("> Error calling function!\n");
     return 1;