Replace org.json with Jackson

[sublimator]

The former is horrifically slow!

[sublimator]

https://github.com/sublimator/ripple-lib-java-sucks

[sappenin]

@sublimator I recently had a need for this library, and didn't realize you had a more mature fork. Glad I happened upon this version!

I have a project that's using Jackson (but also imports ripple-lib-java) and found a nice bridge in the Jackson family (https://github.com/FasterXML/jackson-datatypes-misc/tree/master/json-org). It worked nicely as an API bridge to move from the org.json produced by ripple-lib-java into my code that's based on Jackson. For performance, it would still be good to replace org.json entirely, however.

Connecting this issue with #11, I've had extremely good experiences with the immutables library. Not only does it have a very nice API and ensure immutability, it's also nicely compatible with Jackson and removes a lot of boiler plate code. Also very performant in my apps that are very high TPS.

[sublimator]

haha I lost most the client code for this 2 stolen laptops I think this uses jackson now? not in a particularly fantastic way ... but? email me anyway!

[sublimator]

re: lost code who cares changes

[sublimator]

Found the issue/thread!

I've had extremely good experiences with the immutables library.

Oh right, most the classes are "effectively" immutable, with no in place modifications etc and generally you aren't allowed to construct invalid objects.

It would be nice to check out immutable but I don't personally have the need/time atm.

I'm not sure how much work it would be.