import installed plugins for mac (IDEA-132024)

(cherry picked from commit c17cba6cf3c7913d7fef65a25af088d841891f4e)
diamonds: constructor varargs (IDEA-131918)

(cherry picked from commit f0fc85674e9c62f756f02cec81d87f0229820994)
guess expected types: limit processed members (IDEA-132072)

(cherry picked from commit fa51c9c53ab50c0c7992134d16a482557a739855)
fix message for final locals used inside local/anonym classes in java 8 (IDEA-131949)

(cherry picked from commit ddbaef946208b68854e4cf8dc56b169872cb5c0a)
IDEA-131811 Wrong grammar in a message box text

(cherry picked from commit acc4cb4cb2b4a4f80c4e3ac68def007ea769bd8d)
RUBY-15889: restoring workarounds for merge/diff/line commands to make "launcher ." work on Mac again
reviewed by Aleksey Pivovarov
(cherry picked from commit 004eae1)