Now group of Ui::Radiobutton instances share Ui::RadiobuttonGroup.
All value management is done through the group instance, not through
separate radio buttons. Also a template for groups over enums added.
Added LocalStorageBox for watching info and clearing local storage.
Local passcode and cloud password state display and editing done.
Temporary download location clearing link added.
Crash fixed in local storage clear + app close, now waiting for the
clearing thread to quit. Some design improvements and testing.
Left: auto update, privacy and security, local storage box +
some minor things, like design fixes, codes like loadlang and
clearing of the local storage (box) and temp download folder.
John Preston