* changed preferred composer install method from «source» to «dist»

Add platform config for target PHP version so that suitable dependencies are installed even if composer is run with a newer PHP version. (#1030)

- Only used in development mode; provides more detailed debugging details.

* updated vendor folder
* added sabre/vobject to vendor
* added sabre/vobject to composer.json
* added vCard support for patron profiles in FincILS

- Resolves VUFIND-1221