Search and usability improvements, bug fixes

8f8eaaa Fix account deletion.
1d887b8 In contact sync, do not prepend data with prefixes (it's redundant).
1e6b318 Move Connection settings to a separate page in bundle.
22234a0 Fetch user desc in service extension if missing.
ddc7fa9 Explicitly handle "sub" push notifications in the foreground.
58876e7 Attempt fixing {note recv} for push notifications.
59762be Pass background fetch when topic is attached.
1755cf8 Enable push notification background processing.

Full list of changes: v1.3.3...v1.4.0