GitLab

* feat:new command "join" and "remove" to force join or remove avatar in your current team

* fix:change MaxAvatarsInTeam from 9 to 4

* feat:update & merge branch.Translate fix

* fix(command):fix remove command a stupid bug.Loop delete element bug.

* fix(command):fix join command. When adding avatars, repeat avatars skip and non repeat avatars join.

* fix(language):fix join command remove command translate

* fix(ReadMe):update README.md join and remove command.

* Change the command `permission` usage

* Change the command `permission` usage

* Auto generate mapping files with command `java -jar grasscutter.jar -gachamap`

* Static file provider
  * For gacha record webpage
  * All static files should be stored at `GRASSCUTTER_RESOURCE/gcstatic/`
  * Can benefit other subsystem in future when webpages involved

Update readme because the commad /clearartifacts and /clearweapons have been merged in this PR https://github.com/Grasscutters/Grasscutter/pull/245

* Give Artifact: Fix error & Rename alias

* Update README.md