2.3-b446

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New feature, click menu item path to open path, and click menu item cmd to open and select exe file. #36

If path is empty and cmd is absolute path, path will be replaced by path of exe file from cmd. All other relative path is relative to where CommandTrayHost.exe locates.

If working_directory starts with > symbol, it is relative to where CommandTrayHost.exe locates. All other relative path is relative to path.
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<--zh-CN-->
实现#36，点击菜单中的path，会通过资源管理器打开目录；点击cmd，会通过资源管理器打开并选中exe文件。

#34 #37 ， 整理了一下path与working_directory的相对路径规则。对于working_directory引入了>符号表示相对于CommandTrayHost.exe所在的目录。具体规则可以参考内置的config.json或者项目的wiki(更加详细一些)。
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