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.

build-scripts/config_common.cmake

@@ -116,6 +116,24 @@ else ()
   unset (LLVM_AVAILABLE_LIBS)
 endif ()
 
+########################################
+## semantic version information
+
+if (NOT DEFINED WAMR_VERSION_MAJOR)
+  set (WAMR_VERSION_MAJOR 1)
+endif ()
+
+if (NOT DEFINED WAMR_VERSION_MINOR)
+  set (WAMR_VERSION_MINOR 0)
+endif ()
+
+if (NOT DEFINED WAMR_VERSION_PATCH)
+  set (WAMR_VERSION_PATCH 0)
+endif ()
+
+configure_file(${WAMR_ROOT_DIR}/core/version.h.in ${WAMR_ROOT_DIR}/core/version.h @ONLY)
+########################################
+
 message ("-- Build Configurations:")
 message ("     Build as target ${WAMR_BUILD_TARGET}")
 message ("     CMAKE_BUILD_TYPE " ${CMAKE_BUILD_TYPE})