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* Fix the following issues:
1. HashMap non-thread-safe issus
2. Fix the same problem in pr621, but use a better implementation

Add the following functions:
1. There is now a language cache inside getLanguage to prepare for different languages corresponding to different time zones where the accounts in the server are located

* add /language command,each account has their own Locate

Format string is `"given_level": "Given %s with level %s %s times to %s"`

fix issues 648 677

Change target perm from target.perm to x.perm.others

fix #635

Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>

Optimize multilingualism (using variables)

Add multilingual support

* Fixed `/setstats hp` without changing the max hp.

The Max HP should be modified.

* Add `/setstats mhp` to set Max HP

Limit the avatar level given by "/givechar" command.
If avatar level >90, the game will freeze if open the character interface.

Level should be **lower than 16**