Merge branch '2' into 3

# Conflicts:
#	src/GraphQL/Operations/AbstractPublishOperationCreator.php
#	src/GraphQL/Operations/CopyToStageCreator.php
#	src/GraphQL/Operations/PublishCreator.php
#	src/GraphQL/Operations/RollbackCreator.php
#	src/GraphQL/Operations/UnpublishCreator.php
#	src/GraphQL/Plugins/UnpublishOnDelete.php
#	src/GraphQL/Plugins/VersionedDataObject.php
#	src/GraphQL/Plugins/VersionedRead.php
#	src/GraphQL/Resolvers/VersionFilters.php
#	src/GraphQL/Resolvers/VersionedResolver.php