Some wamr-ide improvements (#1354)

including:
- enable macOS support
- documentation improvements
- fix some warnings

test-tools/wamr-ide/WASM-Debug-Server/Docker/build_docker_image.sh

@@ -1,8 +1,9 @@
+#!/bin/bash
+
 # Copyright (C) 2019 Intel Corporation.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-#!/bin/bash
 docker build -t wasm-debug-server:1.0 .
 
 # delete intermediate docker image
-docker image prune -f
+docker image prune -f