Fixex #2978 - Settings: "System" instead of "More Options"

- moved basic member settings to subscreen in gc-services
- new settings screen "Navigation"
- renamed "More Option" to "System"

The basic member screen preference gets disabled after checking login if you are premium. I couldn't find out how to redraw the setting that it shows as being disabled instantly. It only looks disabled after leaving the Settings and reentering the settings again. The basic member preferences inside the bm settings screen are shown as disabled/enabled correctly.