During upgrade, the config settings aren't always available due to
base.php changes. This fix makes the update info page read the product
name and version from the update template, which already had them.

The actual share permissions sent to the server on reshare are now based
on possiblePermissions + permissions inherited from parent share

`$this->info` can very well contain an empty array or possibly other values. This means that when this code path is called a PHP Fatal error might get thrown which is not what we want.

* options for timeout in seconds and if it contains HTML
* if timeout is 0 it will show the message permanently
* removes the notification after a given (default: 5 seconds) timeframe
* based on work by @brantje
* provide JS unit tests for notifications

* add disableEscape parameter to disable this functionality
* drop usage of escapeHTML() that is now done inside t()
* add unit test for escaped and not escaped placeholder
* proper JSDoc