Form and render elements in Entity reference actions 1.x

Primary tabs

Element machine name	Type	Class	Namespace	Description
ajax_dropbutton	RenderElement	AjaxDropbutton	Drupal\entity_reference_actions\Element	Plugin annotation @RenderElement("ajax_dropbutton");
simple_actions	RenderElement	SimpleActions	Drupal\entity_reference_actions\Element	Action element without primary classes.