This partially fixes the issue of packets not being retransmitted
before they expire in 10 seconds, introduced in 0.9.48 as reported by
jogger at http://zzz.i2p/topics/3003
Fast retransmit was also suggested by jogger as a solution and discussed in that thread.
This code is based on the requirements for TCP fast retransmit
as specified in RFC 5681 but cannot precisely follow the RFC
as UDP messages can be dropped without affecting later messages:
- nack counter is per-message, not per-connection
- some interactions with the retransmit timer when in fast retx mode
- msg expiration is currently 10s but max RTO is 60s
- interactions with individual fragment transmission implemented in 0.9.48-5
- this is a sender-side fix but it depends on far-end ack resend strategy

Maintain a local message sequence number and store
it in OMF, previously unused as codel is disabled
Removed acked messages from _outboundMessages as usual,
but stores message and seq. numbers in a LinkedHashMap,
so we may interpret additional acks as nacks.
Calculate the highest-acked seq. number for every incoming packet.
Marks messages older than highest acked as nacked
Fast-retransmits after 3 nacks
Window and SST adjustments per RFC 5681 sec. 2.4
Reduce resend ack quantity and timeout to improve odds of receiving "nacks"
Disable wakeup of OMF from IMF; should not be needed now that PS calls nudge()
PS.acked(partial) now returns true if any fragment was acked, not if complete
Log tweaks

Still todo: possible additional changes to ack resend strategy;
possible parameter adjustments including msg expiration;
confirm that OMF wakeup in IMF is not required;
further testing and cleanups;
take additional ideas from alternative proposal in MR !8;
stat tweaks;
find related tickets to close

Reviewed by and contains code from zlatinb in MR !8
This builds on several previous SSU improvements; see #2427 for a list.
ref: gitlab MRs !8 !9 !10 !11

Properly lock options map
Remove unused configured variable

Add description to gradle update tasks
Add note about jetty versions

Several fixes for i2ptunnel gradle build

Reduce max time to defragment
Make logging of errors consistent
cleanups, stat tweaks

Add resources to jars and wars
remove .jsi and .jsp files from wars
remove classes that are in jars from the wars for apps that have both
compile jsps in routerconsole.war
build routerconsole.jar

Remove some CSS that applies to images that aren't present in the current software. Also switch to version 2.8.0 of sonarqube in travis.yml since 3.0.0 does not seem to be available as a gradle plugin for this version

Extend lookup expire time
Cleanups

add a bundle target to ant that generates a current git bundle and corresponding torrent.

See merge request !1

# Conflicts:
#   build.xml

Still required for ECIES build replies; previous checkin broke it
Make a new pattern id for N without responses
Fixes ECIES build replies

Escape tunnel nicknames on LS debug page

supporting EdDSA doesn't support LS2.