calendar or contacts app. It doesn't make sense to build a exclude list by the
share API, the apps knows best which are valid targets.

Fix #4823

to a "constants" class

The getItemsSharedWith function also retrieves related information,
resulting in work that isn't used here.

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/owncloud/core/inspections/cdfecc4e-a37e-4233-8025-f0d7252a8720

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 - PHP PDepend

Issue #7111

add a optional parameter to skip check for expired files, this is necessary to find out to whom a file was shared after it was expired.

Use a DateTime object and have conversion handled by Doctrine instead of using
a date string with a fixed format.