Added: Sort clause for sections
Added: DatePublished sort clause for Solr
Added: methods to enqueue operations to be run at transaction commit
Added: more aliasing
Added: Implementation of the MultipleStringField
Changed: commenting code that doesn't work yet

Object states does not seem to be implemented completely, commenting for
now.
Changed: adapted Solr fixtures against results received
EZP-20829: Fixed criterion input parsers mediaType tags
Fixed EZP-21133: POST /content/views has a wrong media-type
Fixed an error in REST Functional UserTest
Fixed wrong @covers
EZP-20438 - Fixed mandatory 'template' node in semantic configuration
EZP-20438 - Fixed controller reference in routing/internal.yml to use the view controller alias
EZP-21103: Added router to valueObjectVisitor
EZP-21103: Refactored ContentTypeGroup VOV + test
EZP-21103: Refactored router testing in VOV tests
EZP-21103: Refactored Version VOV + test
EZP-21103: Refactored VersionInfo VOV + test
EZP-21103: Refactored UserSession VOV + test
EZP-21103: Refactored VersionList VOV