Refactor CompletionSuggestionKind

- Remove many CompletionSuggestionKinds that duplicate ElementKind
- Add two new CompletionSuggestionKinds: INVOCATION and IDENTIFIER
- regenerate Analysis Server Dart and Java API and docs
- rework Dart and Java tests
- remove/rename unused Dart and Java classes and methods
- remove unnecessary reference to SDK

BUG=
R=brianwilkerson@google.com, scheglov@google.com

Review URL: https://codereview.chromium.org//684183002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41396 260f80e4-7a28-3924-810f-c04153c831b5