Update EthJS dependencies

[ScottyPoi]

As @ethereumjs package updates are released, we should update the versions in our dependencies. There are many breaking changes, so this will require some code updates as well. For example, our use of static constructors like Block.from... and BlockHeader.from... will need updating.

[holgerd77]

It would be cool and useful if you directly start with this based on the currently released alpha versions. Then you can directly be a "test user" and identify potential UX issues.

[acolytec3]

It would be cool and useful if you directly start with this based on the currently released alpha versions. Then you can directly be a "test user" and identify potential UX issues.

I'll look at this today. I started on it at one point and it felt like it was a huge lift. I think there might be some variance still between the alpha releases in our current master branch