log tweaks

by processing DSM inline in InNetMessagePool.
Caused random lookup failures of RI and LS.
Made worse by previous change removing duplicate store from reply job.
thanks obscuratus and drzed

to not break Android build
ref: Gitlab MR !64

Use a single ack timer for each session rather than
creating a new one for every ack
Log tweaks

explicitly set types of some objects so that the code can be compiled with a Java 7 bootclasspth

See merge request !64

Check for deadlock more frequently

Primarily for devs. No UI.
remove shutdown hook ID

as the console will do the lookup if not

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