Added: replies & mentions, view-once, PTV, albums, poll votes, pin/keep, group
invites, member tags, events, LID<->PN lookups + :lid_mapping_update event,
Android browser mode, and receive-side classification of more inbound types.

Fixed: mark_online_on_connect honored (#2553), pinned chat state always boolean
(#2328), audio :waveform/:seconds warning (#2646), plus the 0.2.2 storage
cold-start fix. No breaking changes.