Pass form_state to plugins.
Issue #1647802 by franz: Added Tamper to map any value to the Entity that holds it (in some field).
Fix type hint.
Remove value if it does not match.
Issue #1784052 by John Bickar, acrollet: Added url{en,de}code plugins.
Issue #2119745 by illeace: Fixed Fields converted to arrays during import are not processed as arrays by subsequent plugins.
Issue #2252775 by kporras07: Fixed Use url() for creating links.
Issue #2252775 Move text to make translation easier.
Issue #1979210 by TechNikh: Fixed check if url is empty in absolute_url plugin.
Issue #2180051 by mzanon100: Use preg_quote() to escapte user inputed regex.
Add integration tests for some complex scenarios.
Add more integration tests for the copy plugin.
Issue #1836372 by twistor, thedavidmeister | kervi: Fixed can't start any import : Function name must be a string .
Issue #2219747 by twistor | sherakama: Added support to key word filter for multiple values.
Issue #2219747 by twistor | sherakama: Use loop system.
Issue #2053141 by m.stenta: Fixed Deleting a field from the importer does not delete tamper plugin.
Fix source name problems once and for good.
Fix strict error.
Issue #2263295 by glendemon: Fixed PDOException when saving long ids.
Issue #2194583 by David_Rothstein: Added State and country plugins should allow already valid abbreviations to pass through.