JBIDE-17852 Ionic palette items should be available as templates in HTML code assist
JBIDE-17726 Wierd proposals in css content assist for ionic projects

CSS Proposals are fixed
NPE in CSS Hyperlink is fixed
JUnit Test Case is added

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
JBIDE-17852 Ionic palette items should be available as templates in HTML code assist. Fixed ionic proposal relevance.