[IDEA] Tested PsiNamedEObject: get and set name methods

Change-Id: If2ab24c4d16aa222c6c287fabcc072835b3f7280
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[intelli] fixed NPE when invoking CA in empty file
rewritten completioncontributor in Xtend
[intellij] extract AbstractCompletionContributor
[formatter2] improved JavaDoc
Merge "[IDEA] Tested PsiNamedEObject: get and set name methods"
Merge "[formatter2] improved JavaDoc"