If Run sets the current height field, it is technically a race between Run and
other methods reading the field. Setting in New is a safer option.
Removed a check that height is not 0 from static address manager.
This commit adds the listening for sweep requests from the server.
On a sweep request the loopin manager will fetch the loop in from the
db, do sanity and safety checks and then sign the psbt for the input
and send it back to the server.
