UI: factory: parse property element syntax for widget properties
UI: factory: parse property element syntax for widget properties

* Partially revert "tmpl:property" syntax from commit 6230b78cd2fd008bdafdfedbbe6f7cb8a4bac11c

tim-janik/rapicorn,tim-janik/rapicorn,tim-janik/rapicorn,tim-janik/rapicorn,tim-janik/rapicorn