Provide a ignore autojoin setting for Bookmarks
Description of the new feature
Add a ignore autojoin flag setting on a account
This is useful if you dont want changes on the autojoin flag in bookmarks, synced to Gajim.
For example if you leave a group chat on your smartphone because it is very noisy, also Gajim would leave this group chat.
The setting allows to have a local autojoin list