[JBIDE-17611] Error when calling Tern code assist via command

Update preferences for Node.js at startup and set first none native as default
Remove duplicated org.eclipse.ui dependency
Added a preference that disables repeatable Node.js config change

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
@angelozerr Yes for sure. This code is just a workaroud. The correct Node.js installation should be selected by Tern.java itself.