Enable the semantic version mechanism for WAMR (#1374)

Use the semantic versioning (https://semver.org) to replace the current date
versioning system, which is more general and is requested by some developers,
e.g. issue #1357.

There are three parts in the new version string:
- major. Any incompatible modification on ABIs and APIs will lead to an increment
  in the value of major, which mainly includes: AOT calling conventions, AOT file
  format, wasm_export.h, wasm_c_api.h, and so on.
- minor. It represents new features, including MVP/POST-MVP features, libraries,
  WAMR private ones, and so one.
- patch. It represents patches.

The new version will start from 1.0.0. Update the help info and version showing for
iwasm and wamrc.

product-mini/platforms/windows/main.c

@@ -50,6 +50,7 @@ print_help()
     printf("  -g=ip:port             Set the debug sever address, default is debug disabled\n");
     printf("                           if port is 0, then a random port will be used\n");
 #endif
+    printf("  --version              Show version information\n");
     return 1;
 }
 /* clang-format on */
@@ -339,6 +340,12 @@ main(int argc, char *argv[])
             ip_addr = argv[0] + 3;
         }
 #endif
+        else if (!strncmp(argv[0], "--version", 9)) {
+            uint32 major, minor, patch;
+            wasm_runtime_get_version(&major, &minor, &patch);
+            printf("iwasm %u.%u.%u\n", major, minor, patch);
+            return 0;
+        }
         else
             return print_help();
     }