Features and Fixes

• Add plugin APIs: "on_*_capability_async" and "on_session_end_async" (#1638) (Rafał Chłodnicki)
• Lazily update log panel when it's opened (#1636) (Rafał Chłodnicki)
• Various improvements to the server troubleshooting functionality (Rafał Chłodnicki)
• Disable crashed servers in-memory instead of in project data (#1647) (Rafał Chłodnicki)
• Handle all cases where selection is absent thus resulting in a crash (#1646) (Rafał Chłodnicki)