Add list group header to the left nav of user settings dialog

[JohannesDoberer]

Add a new category on left nav for user settings. Also the schema needs to be extended.

For more details (B5) https://wiki.wdf.sap.corp/wiki/pages/viewpage.action?pageId=2104434679 https://wiki.wdf.sap.corp/wiki/display/visualcore/Settings+%28Fiori+3%29+-+Master+Area "Current App" and "General settings" should also be configurable

[hardl]

In the first link, there is no B5, second link is dead. Still valid?