- 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
- historylog widget now uses webcomponents for timestamp & user, and whenever possible for values
- History::get_rows() formats customfield date/date-time values as needed
- implement setDetachedAttributes(), if nextmatch & historylog are calling them on webcomponents, might as well use that to set what they pass