Rewrite result

[supersaiyansubtlety]

Rewrites Result so it has separate Ok and Err implementations.

Also adds javadocs.

Notably it doesn't hide the Ok and Err implementations; it didn't seem necessary. hid them in package-private classes to be safe
(I'm also not sure if util is part of the api or not)

[OroArmor]

Me when rust

[ix0rai]

to me util isn't API, we're allowed to break whenever we want. if a util class is worth exposing as API we'll do an api.util package