In this commit, we add support within lnwire for the optional dataloss
fields in ChannelReestablish. With these fields, it’s possible to:
verify that the remote node really knows of the state of our prior
local commitment, and also that they’ve sent us the current commitment
point for their current state.
In the event of dataloss, it’s possible for the party which lost data
to claim their commitment output in the remote party’s commitment if
they broadcast their current commitment transaction.
In this commit the reestablish message have been added, which serves as
channel state synchronization message. Before exchanging the messages
for particular channel peers have to send it to each other as the
first message in order to be sure that non of the updates have been
lost because of the previous disconnect.
