JBIDE-14383 Text formatting in jQuery Mobile wizards preview in Windows.

Algorithm is improved. Instead of summing up char widths,
line width is requested from swt. Char width does not include
head and tail widths, which are zero in Ubuntu, but non-zero
in Windows.
JBIDE-13890 OpenOn for <div data-role="page">: "Open With BrowserSim"
JBIDE-14378 Fixed org.jboss.tools.jst.web.ui tests
JBIDE-14398 New Collapsible Set wizard

Implemented New Collapsible Set wizard. Test is added.
JBIDE-14364 Select best browser for jQuery Mobile Palette Wizards

Webkit is preferred for Range Slider, Panel and Table wizards.
JBIDE-14408 jQuery Mobile wizards miss characters when you typing

Tried collecting characters typed while focus is stealed by browser
to insert them into initially focused field editor when forcefully
returning focus.