GroupChatControl: Add settings page

Daniel Brötzmannrequested to merge
groupchat-settings into master

This adds a settings page for group chat settings to the GroupchatControl.

Settings page:

  • print_join_left
  • print_status
  • notify_on_all_messages
  • minimize_on_close
  • minimize_on_autojoin
  • send_chatstate
  • sync threshold
Edited by Daniel Brötzmann

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