JBIDE-17994 HTML preview should support projects with no webroot defined (i.e. non-wtp projects)

option to change webroot folder added
JBIDE-18112 vpe version should be 3.6, not 3.5.100
Updated parent pom to CR2
JBIDE-17886 Visual Editor: Links is not blocked when page content is fulfilled with javascript
JBIDE-18237 NPE when editing HTML page in VPE

while setting source editor documentListener was added. It is needed for visual/source tab but not needed for Preview tab