Implement performance profiler and call stack dump, and update toolchain document (#501)

And remove redundant FAST_INTERP macros in wasm_interp_fast.c, and fix wamrc --help wrong line order issue.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

build-scripts/SConscript_config

@@ -1,15 +1,14 @@
-
-
-import os
-import re
-
-from building import *
 #
 # Copyright (c) 2021, RT-Thread Development Team
 #
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 
+import os
+import re
+
+from building import *
+
 Import('rtconfig')
 
 src = Split('''