Remove ERR- and WARN- prefixes from translated status strings

Fix encode/decode search param
Copy CSS to non-default themes, not tweaked yet
Add support for shorter nf_ prefix to XSS filter
Remove unneeded float_right, reported by drzed

WIP, more polishing todo
default theme only, others to follow

searches torrent names only
CSS fixups to follow

Use extension version if client not known
Consolidate getAzVersion() calls
Add notes about client identification

for new and existing installs
Reported by Opicaak

minor cleanups

previously just closed the socket

previously just closed the socket

previously just closed the socket

Message/log cleanups

as suggested by drzed

Don't show zero send/receive BPS after 15 sec idle; show smoothed value,
so display isn't mostly zeros.
BPS sorters will now work correctly and totals are more accurate.
Pass now to send/receive BPS methods and BW estimator
Comment out UDPTransport.noteSend()
Fix alignment issue in NTCP peers table
Show 0 instead of 0.00 for zero BPS
Change rounding mode of formatters

Convert IPv6 addresses to canonical form

add i2pd console to list

to be only what stats.i2p needs
Disabled until next release, to preserve dev build anonymity,
tested while enabled
Commented out unsed code
ref: http://zzz.i2p/topics/3515

Command error handling and message improvements
Implement simple HELP command
bump -1

Minor cleanup of dup strings

Use PortMapper constants to check registration
Reported by lbt

As proposed at http://zzz.i2p/topics/3520

Waste of space and probably slower

reported by lbt

Remove patch from debian files

Including bionic build fix
Don't know why focal worked without it

Update checklist to specify bootclasspath, so these are caught in the future
bump -16-rc

Reported by drzed

Remove dup line
Reported/tested by lbt

use a containsKey()+put instead of putIfAbsent because putIfAbsent is not present in Java 8, thereby breaking Maven builds