0.43.0

• enhancement - optimize server initialization. See #869.
• enhancement - download Java sources lazily for Maven projects. See #870.
• enhancement - added Generate toString()... source action. See #873.
• enhancement - show more detailed progress report on startup. See #883.
• bug fix - completion cache resets after file recompilation resulting in slow code completion. See JLS#847.
• bug fix - fix jar detection on windows, for invisible projects. See #882.