minor
use qxWeb for content element creation
added scrolling and image manipulation methods
normalize value
don't remove falsy class name
fixed DOM element access
apply separator styles directly to element
access DOM elements through qxWeb API
fixed color reset
use qx.Desktop event layer
fixed DOM element access
create DOM element if necessary
remove listeners from content element on dispose
minor
check if image update is necessary
replaced html.Element with qxWeb
[BUG #7710] Prototype of website unified widget set.
[BUG #7710] Use explicit class for qxWeb initialization.
[BUG #7710] Fix inline apps
[BUG #7710] Added button prototype.