libjetty9-java used to depend on libservlet3.1-java
but now in sid it doesn't.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=997213

Source remains for now and may still be built with ant buildBOB.
Existing non-package installs will continue to work.

fix a lintian warning about compare-versions
update launchpad doc for git

Fix build error dh_installdocs linking from the libjbigi-jni arch package
to an arch:all package, this is an error for compat level 10.

checklist updates

Eepsite: pull new and updated help translations

Replace possibly more-translated, but very very old (not from transifex) pages

refresh patches
update release docs

https://bugs.launchpad.net/ubuntu/+source/i2p/+bug/1784023

Ant version 1.9.8 or higher now required
Drop support for Xenial package build
Fix up BOB build configuration
Fix i2psnark standalone build

Patch adapted from Gilles Filippini
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960589

Bundle 2.0 API only; remove 1.1 API
Convert DoH, NDT, and i2pcontrol to the 2.x API
Fix i2pcontrol handling of number values and serialization for 2.x API
Remove xenial dependency on libjson-simple-java, it has only 1.1
Set min and max version constraint on libjson-simple-java for bionic+
Based on patch from Gilles Filippini
ref: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901827
This does not support 3.x but the patch for that will be smaller.

Add xenial patch to ant test target

Add ant target to validate patches

not needed for rrd4j with our patch

does nothing with Jetty 9.4 (ticket #2599)