make sort criteria configurable

* sort options can be set in the »sort« TypoScrip setting
* it is an array, containing arrays with keys:
	* id: string (for the default item it is »default«)
	* sortCriteria: Solr sort parameter (comma-separated list of »fieldName [asc|desc]«)
* if more than one option exists, a sort menu is displayed
* localisations for the menu items are taken from the locallang-form.xml file
* the selected sort order is added to the underlyingQuery information for the detail view