* I2CP:

      - Append I2CP Version information to the Get/Set Date Messages,
        so that both the router and client are aware of the other side's version,
        and future protocol changes will be easier to implement.
        Previously, router version information was not available to the client,
        so when router and client were in different JVMs,
        old clients would work with new routers
        but new clients would not work with old routers.
        After this change, we can design future changes so that new clients
        will work with old routers.
        This is an enhancement to the old protocol version byte sent by the client,
        which we have never changed and probably never will.
      - Prevent a client from setting the router's clock
      - Javadocs