More languages support

[lijinhong11]

The enum message cannot be customized at all (excluding decompile jars) And I saw some people in China who like your plugin (some people from other countries should also be), so I really hope you can rewrite a message processing structure. The structure is as follows:

1. Create MessageHandler
2. Put some methods about send and get
3. Other classes use MessageHandler to get or send messages

And there's some questions I want to ask:

1. Why you use the useless enum Message object?
2. Why MessageLoader needs set message in a Message object? I think create another class to store message context (not the Message object) is great.