Issue #3443627: Adds integration plugins

Tim Tripprequested to merge
issue/ckeditor5_icons-3443627:3443627-attribute-on-parent into 1.x

This update includes two new standalone integration plugins for integrating with outside plugins:

  • IconLinkEditing: Extends the icon schema to add linkHref as an allowed attribute for icons. Requires the LinkEditing plugin to be enabled.
  • IconGeneralHtmlSupport: Preserves allowed HTML attributes on icons and links wrapping an icon that were previously being improperly stripped. Requires the GeneralHtmlSupport plugin to be enabled. Resolves #3443627

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