WIP, still disabled, proposal not complete

- Use ChaCha20 to encrypt/decrypt records
- Add OTBRM methods for plaintext record
- Add OTBRM checks for correct plaintext slot number
- Add BRR checks to prevent use of nonexistent AES key/IV
- Set plaintext reply at OBEP in BuildHandler
- Allow OTBRM in InboundMessageDistributor
- Remove timing measurements in BuildMessageProcessor.decrypt()
- Add test to BuildMessageTestStandalone for outbound build
- Add check for all replies to BuildMessageTestStandalone
- Log tweaks

Older miniupnpd 2.0 will send a SSDP search response with an IPv6 location to a IPv4 address,
but newer ones 2.2 won't. So we need to also bind to an IPv6 address for the SSDP search
to receive the router's IPv6 location. Then we can bind to our public IPv6 address
for a port forward and it will work when miniupnpd is configured for "secure".

Also, don't bind a POST request to a mismatched v4/v6 address.

Add support for dmg and exe updates

See merge request i2p-hackers/i2p.i2p!33

and make package private, so all the tunnel build classes are in one place.

by making it always nonblocking.
as reported by drzed

of peers. For efficiency.
ref: http://zzz.i2p/topics/3082
thx: jogger

- Generate and parse short record format
- Encrypt and decrypt short records
- Register handlers for 3 new messages ITBM/STBM/OTBRM
- Send ITBM/STBM if all hops support it (disabled)
- Reply with OTBRM at OBEP if STBM received (disabled)
- Send STBM at IBGW if ITBM received (disabled)
- Add logic for when to send new messages
- ChaCha encryption of other short records
- Fix compare logic in ITBM parser (ticket #2814)

All is still preliminary, disabled, untested; proposal is still incomplete

Still todo:
- Fill in plaintext record for ITBM/OTBRM
- OTBRM key/tag

Merged in our previous javadoc fixes
Their updated font-selector code remains commented
out in RrdGraphConstants.getFont()
Now requires Java 8

Fix padding on file chooser buttons

checklist updates

set min-height of susidns iframe to the height of the browser's viewport, and automatically show the howitworks section on the susidns homepage. Gets rid of the double-scrollbar on the iframe

See http://i2p-projekt.i2p/en/docs/api/samv3 for maintained list of v3 clients
Remove unmaintained v3.0 protocol doc, link to website instead