JBIDE-17175 org.jboss.tools.jst.web.kb.test and org.jboss.tools.jst.web.ui.test tests failure on Windows

Fixed org.jboss.tools.jst.web.ui.test.InsertJSCSSPaletteEntryTest
JBIDE-17170 Tab jQuery of Properties View: Different set of fields when you change field "Data Role" or if you select tag "div"

Check for necessity to update property descriptors is improved.
Instead of comparing attribute names only, values of attributes
that may influence node structure is checked as well.
Updated IVisual interfaces for vpv compatibility