* 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
Use `LOG_LEVEL` environment variable to override logging level for `emu.grasscutter` (which also contains all loggers under it). This might help with debugging various issues reported by users. Previously, the only way to override these levels would be to use `-Dlogback.configurationFile`
* improve server side command line input
* prevent multiline logs from covering typed commands
* reduce text in console
* resolve conflicts caused by multilanguage
Co-authored-by: Magix <kobedo11@gmail.com>