* i2ptunnel:
      - Use context properties as defaults

      - New SDSCache for SimpleDataStructures
      - New SimpleByteCache for byte[]
      - Cache Hash, PublicKey, and SigningPublicKey
      - Remove global lock in ByteCache

      - Move BWLimits and DestLookup message support from
        I2PSimpleSession to I2PSessionImpl
      - Include the Hash in the DestReplyMessage on a failed lookup
        so the client may correlate replies
      - Add support for parallel lookups and BWLimits requests
      - Add support for specifying the timeout for DestLookups
        (can only be smaller than the router timeout for now)
      - Extend dest lookup router timeout from 10s to 15s

                   tens of thousands of them

               neither required at compile time.

      - Add SSL support - To enable, change clients.config. Examples:
            ## Change to SSL only - just add a '-s'
            clientApp.0.args=-s 7657 ::1,127.0.0.1 ./webapps/
            ## Use both non-SSL and SSL - add '-s port interface'
            clientApp.0.args=7657 ::1,127.0.0.1 -s 7667 ::1,127.0.0.1 ./webapps/
            ## ...and change URLLauncher args further down for the browser to open https:// at startup if you like.

      EOFException instead of a DataFormatException on EOF,
      which should lower the log severity in I2CP and I2NP
      when a client or peer disconnects.

      - Reduce thread pool sizes based on memory and/or bandwidth limits
      - Tweak some thread names for clarity