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Closes #1468

Add offline state for pending contacts

Closes #1580

See merge request !1138

Add strings for duplicate pending contacts

See merge request !1137

# Conflicts:
#   briar-android/src/main/res/values/strings.xml

Add string for pending contact offline state

See merge request !1136

# Conflicts:
#   briar-android/src/main/res/values/strings.xml

Add version negotiation to sync protocol

Closes #1587

See merge request !1134

This can overwrite the initial state broadcast by the
rendezvous poller.

Add strings for warning when adding a contact is slow

See merge request !1135

Add support for temporary messages

See merge request !1132

Retry database tasks after signing in

Closes #1576

See merge request briar/briar!1131

Receive external intents through NavDrawerActivity

Closes #1562

See merge request briar/briar!1128

Show "connecting" state for pending contacts

See merge request briar/briar!1129

This is because we require a special permission to launch this intent
and we prefer requiring this permission to having the NavDrawerActivity
added to the back stack.

This commit also re-adds the deprecated USE_FINGERPRINT permission as
Android Studio would show an error otherwise.

This ensures that our main activity is on the task stack below the
activity opened by an external intent. So when the user navigates back,
they always get back to the main activity.

Publish hidden service for connecting to pending contact

Closes #1564

See merge request briar/briar!1125