[IDEA] Tested XtextPsiReference: highlighting and renaming

Change-Id: I7591f0544057b5585051ca60f471812d7f5b30e3
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[xtend][contentAssist] Fix: Show proposals for static accessors

Also show proposals for ‘this’ and ’super’ after ‘TypeName.’

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=453271

Change-Id: Ibea47cbfdebe16f0c50dcf07f9010d6568301fdf
Merge "[xtend][contentAssist] Fix: Show proposals for static accessors"