Indicate delivery state of messages

Example from Briar Android:

changed milestone to %GTK Next

added T: feature label

API support for those states already exists: https://code.briarproject.org/briar/briar/tree/master/briar-headless#listing-all-private-messages However, we don't seem to emit events when those states change. This should be a small change to briar-headless.

@grote suggested not to handle (non-existent) events for the moment and just refresh the states when opening a conversation.

mentioned in merge request !68 (merged)

assigned to @nicoalt

changed milestone to %GTK 0.1.0-beta2

mentioned in commit 0dcb79d3

mentioned in commit d458d5e5

mentioned in commit 58268754

mentioned in commit 859cbe62

mentioned in commit 64a08140

mentioned in commit 3f950a58

mentioned in commit 46d68d1f

mentioned in commit 3425eb8a

mentioned in commit f48ed5e1

closed via merge request !68 (merged)