fix: A positioning bug in Firefox.
doc: Widget Scaffolding.
mov: Refactored the namespace and the widget api.
fix: Arranged the loading order of each components.
mov: Changed the namespace from #main to #peditor.
add: The PDT namespace.
opt: The history handling.
fix: A property data store bug.
fix: An editor display bug.
fix: A typo.
add: File size sum.
mov: Renamed the widget scaffolding to widget editor.