remove old expose view / blueimp gallery and all widgets which have been using them:

- new web-components are unconditionally replacing them via the preprocessor
- some widgets (eg. et2_description) could not be removed as other legacy widgets are extending them, but they are no longer registered
- as there are many places using et2_createWidget('description', ...), et2_description returns now web-components for no longer existing widgets

api/js/etemplate/et2_core_widget.ts

@@ -77,7 +77,7 @@ export function et2_register_widget(_constructor, _types)
  * 	is not passed, it will default to null. Then you have to attach the element
  * 	to a parent using the addChild or insertChild method.
  */
-export function et2_createWidget(_name: string, _attrs: object, _parent?: any): et2_widget
+export function et2_createWidget(_name: string, _attrs: object, _parent?: any): et2_widget|HTMLElement
 {
 	"use strict";
 
@@ -96,6 +96,12 @@ export function et2_createWidget(_name: string, _attrs: object, _parent?: any):
 		_parent = null;
 	}
 
+	// check and return web-components in case widget is no longer available as legacy widget
+	if (typeof et2_registry[_name] === "undefined" && window.customElements.get('et2-'+_name))
+	{
+		return loadWebComponent('et2-'+_name, _attrs, _parent);
+	}
+
 	// Parse the "readonly" and "type" flag for this element here, as they
 	// determine which constructor is used
 	var nodeName = _attrs["type"] = _name;
@@ -1185,4 +1191,4 @@ export class et2_widget extends ClassWithAttributes
 
 		return path;
 	}
-}
+}