(This is such a hack and will probably break, but it works for now for
most cases...)

In the future we should probably add a gradient when clipped...

closes #94

Update Ubuntu Build and Install Instructions

Reactions

Db migrations

Add visual indication that data is being fetched

Optimize cpu usage

Keep the almost sorted list around and sort by the raw timestamp value
instead of doing the expensive toMSecSinceEpoch conversion.

We don't get notified for every message. Sometimes we only get a read
receipt for the newest message, which means old read receipts accumulate
in the database. This least to some considerable CPU overhead, when
checking if the timeline should be notified for new read receipts.
Instead just always notify, since that has far less overhead in the
worst case and doesn't need complicated cache cleanup.

The old pending_receipts db is not removed for now. It should still have
minimal storage overhead and we don't have a good mechanism for cache
format upgrades atm.