Replaced custom slots for editing key bindings and shortcuts with default slots from KXmlGui
Set status bar visibility more reliable
Cleaning and fixing save/restore of startup settings. WIP
- maximize switch for window state not needed and buggy
- saveMainWindowSettings() saved but never read (wrong config group)
- no danger of initializing default statusbar. Custom one is always set in constructor
- most config options should be independent from "UI save settings"
Cleaning and fixing save/restore of startup settings: Updated settings dialog to reflect changes
Cleaning and fixing save/restore of startup settings: Save UI components on shutdown by default