Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

eth2/types/Cargo.toml

@@ -1,21 +0,0 @@
-[package]
-name = "types"
-version = "0.1.0"
-authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
-
-[dependencies]
-bls = { path = "../utils/bls" }
-boolean-bitfield = { path = "../utils/boolean-bitfield" }
-ethereum-types = "0.4.0"
-hashing = { path = "../utils/hashing" }
-honey-badger-split =  { path = "../utils/honey-badger-split" }
-log = "0.4"
-rayon = "1.0"
-rand = "0.5.5"
-serde = "1.0"
-serde_derive = "1.0"
-serde_json = "1.0"
-slog = "^2.2.3"
-ssz = { path = "../utils/ssz" }
-vec_shuffle = { path = "../utils/vec_shuffle" }