Issue #2094003 by swentel: Remove use statements in formatters, widgets and field types plugins.

...ib/Drupal/comment/Plugin/field/field_type/CommentItem.php

...omment/Plugin/field/formatter/CommentDefaultFormatter.php

.../lib/Drupal/comment/Plugin/field/widget/CommentWidget.php

...act/lib/Drupal/contact/Plugin/views/field/ContactLink.php

.../Drupal/datetime/Plugin/field/field_type/DateTimeItem.php

...etime/Plugin/field/formatter/DatetimeDefaultFormatter.php

...atetime/Plugin/field/formatter/DatetimePlainFormatter.php

...l/datetime/Plugin/field/widget/DatetimeDatelistWidget.php

...al/datetime/Plugin/field/widget/DatetimeDefaultWidget.php

...l/email/Plugin/field/field_type/ConfigurableEmailItem.php

...b/Drupal/email/Plugin/field/formatter/MailToFormatter.php

...b/Drupal/email/Plugin/field/widget/EmailDefaultWidget.php

...ugin/field/field_type/ConfigurableEntityReferenceItem.php

...Plugin/field/formatter/EntityReferenceEntityFormatter.php

...nce/Plugin/field/formatter/EntityReferenceIdFormatter.php

.../Plugin/field/formatter/EntityReferenceLabelFormatter.php

..._reference/Plugin/field/widget/AutocompleteTagsWidget.php

...tity_reference/Plugin/field/widget/AutocompleteWidget.php

..._reference/Plugin/field/widget/AutocompleteWidgetBase.php

core/modules/field/field.deprecated.inc