fix: Cacheitems can be stored with TTL again. fixes https://dev.quiqqer.com/quiqqer/quiqqer/issues/700

It is now easier to open a user panel:

require(['utils/Panels'], function (PanelUtils) {
    PanelUtils.openUserPanel(USER_ID);
});

feat: Grid -> Grid cells now have a data-index attribute, so it is possible to react to cell events better

feat: the main quiqqer object now has an auth verification method; with the auth message its possible to refresh the user messages, too