JBIDE-18063 Ionic palette: New Checkbox wizard

Implemented New Checkbox wizard,
New Toggle wizard, New Radio wizard
for Ionic palette.
JBIDE-18033 Wrong html tag insertion from Palette into empty html file
JBIDE-18081 Ionic palette wizards do not insert selected js/css links into html template
JBIDE-17981 Ionic content assist for tags and attributes
Merge branch 'master' of github.com:jbosstools/jbosstools-jst into JBIDE-18035