Bug fixes

Lots of community bugfixes. Now Drupal 9 ready.

Upated to support Drupal 9

Fixes for rendering and syntax

* Issue #3133359 by agoradesign: Render array sent to Markup::create in IframeOnlyFormatter.php
* Issue #3133359: Render array not cacheable with tokensupport
* fix devel_dump
* fixes Issue #3136739 by Phil Wolstenholme: Field widget help text displays twice
* Issue #3134596 by aluzzardi: Warning: strstr() expects at least 2 parameters
* Issue #3133949 by gabe.connolly: Duplicate iframe ids on content with more than one iframe
* fixes Issue #2973312 by michaelmol: Support for relative urls

Fixes for rendering and syntax

* take back last commit, leave only cache=0 for tokensupport
* Issue #3133359 by agoradesign: Render array sent to Markup::create in IframeOnlyFormatter.php
* fix devel_dump
* fixes Issue #3136739 by Phil Wolstenholme: Field widget help text displays twice
* Issue #3134596 by aluzzardi: Warning: strstr() expects at least 2 parameters
* Issue #3133949 by gabe.connolly: Duplicate iframe ids on content with more than one iframe
* fixes Issue #2973312 by michaelmol: Support for relative urls

- fixed save edit form
+ Add operations view/edit/duplicate/delete foreach row in table

3.10 includes an important fix required due to changes made at Youtube
Changes since 7.x-3.9:
#1572550: The YouTube video ID is invalid or the video was deleted.