feature: speakers manager - "save unchanged speakers" dialog was changed from "yes/no" buttons to "yes/no/cancel" buttons -> save changes, discard changes, continue editing
feature: speakers manager - "save unchanged speakers" dialog was changed from "yes/no" buttons to "yes/no/cancel" buttons -> save changes, discard changes, continue editing
fix: double confirmation was required when closing speakers manager - yes/no message box for changing speakers canceled closing of window
slight change in speaker api .. owner of dialog windows from now on is main application window - now should be possible implement checking login without need of sending owner window every time check is needed (main block for implementing  login checks)