[IDEA] remove Intellij dependencies for org.eclipse.xtext.idea.generator
plugin

Change-Id: I99bb22912c977061261f6f62f6f1d253ab5f4f3d
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[xtend] fixed problem with interface information not properly set during first phase in Xtend's model inferrer. (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=450482)
Merge "[xtend] fixed problem with interface information not properly set during first phase in Xtend's model inferrer. (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=450482)"