i2pd will send this after retry with zero token and termination

mark session dead after receiving destroy
log tweaks

ref: http://git.idk.i2p/mesh/i2p.i2p/-/issues/6

(i2pd bug, fixed today)

Add RTTdev to logging

(more prep for connection migration)

As fallback for failed lookup by RemoteHostId.
This will eventually be the primary lookup after most traffic is SSU2.
For now, only used to receive traffic from a peer that changed IP/port.
SSU 1/2 send destroy when replacing old session with new.
Prep for full SSU2 connection migration.

Fix errors in HACKING.md

Comment out unused contact property

when in portable configuration and changing the
launch browser on startup setting on /configservice
ref: http://zzz.i2p/topics/3347

Retransmit handshake messages faster and expire faster (SSU 1/2)
log tweaks