Fix wrong group key in "update_group" function
Add "banUpdate" event
Reduce duplication in Ban class
Fix notice about undefined variable in BanController
Create separate function for enable/disable operators
Add notice about triggering event to "update_group" function
Add "threadPostMessage" event
Remove invalid link from Thread::postMessage docs
Remove unused class alias from libs/chat.php
Refactor "check_group_fields" function
Refactor update_operator function
Make operator's login unchangeable
Use "update_operator" func for operator modification everywhere
Add "operatorUpdate" event