JBIDE-14591 https://issues.jboss.org/browse/JBIDE-14591

Implemented categories for Properties view for html elements.
[JBIDE-14591] fix for API compatibility issues

Changes are:
* org.jboss.tools.jst.web.ui.palette.html.wizard.HTMLConstants marked as depecated
* ItemsEditor shouuld implement both new and deprecated HTMLConstants to avoid API tooling problems
* JQueryConstants shouuld implement both new and deprecated HTMLConstants to avoid API tooling problems
[JBIDE-14591] service version updated because API changes

3.5.0-SNAPSHOT => 3.5.1-SNAPSHOT