JBIDE-14733 JUnit tests for JQM Palette wizards code generation/insertion

Added comparing of text generated for text preview
and text inserted into file. They should be equal
when ignoring formatting.
Fixed New Footer wizard (JBIDE-14748) by always
assigning 'end-text' (even empty).
JBIDE-14469 HTML5 label widget

Implemented HTML5 label widget. Test is added.