WIP - not hooked in yet

Extend lookup expire time
Cleanups

- Change router ECIES SKM to use N pattern, remove Elligator2, to match proposal changes
- Allow encrypted messages to ECIES routers
- Allow ECIES routers to become floodfill
- Add XDH factory to VM comm system for tests

The #ls2 team plans to change the specification and re-enable after the 0.9.48 release

Fixup test as required

Additional checks on ECIES BRR to catch old/buggy routers
Detailed logging of ECIES BRR decrypt fails

Preliminary, proposal not finalized, subject to change
Not yet compatibility tested with other implementations
Add peers to match requested length for explicitPeers
remove commented out code
log tweaks

Tag.toBase64() optimization
Javadoc fixes

Pass CloveSet to/from ECIESEngine

Improve DataMessage.toString()

I2CP: Don't require privkeys for meta in CLS2 message

minor efficiency improvements in parsing

Fix error sending large message
Fix NPE after handshake failure