Show number of unseen nick mentions & query messages on launcher entry

Friedrich W. H. Kossebaurequested to merge
work/kossebau/launchentrynumber into master

Config page:
KonversationLauncherEntrySettingsPage

@argonel @psn @buschinski

BUG: 398047

Edited by Friedrich W. H. Kossebau

Merge request reports