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Some refactoring changes include:

- Use short lib names for all crates
- Dismiss patch version requirements
- =worldstate= to =trie=
- =util= to =hex=
- =Consensus= trait in =block= that allows validate an existing block
  and mining a new block

The integrated =etcommon= crate will contain a general Ethereum
blockchain interface. This interface will be built upon a smaller
interface crated in =blockchain=, which contains a general interface
for a blockchain.

A blockchain has its transaction format, account address format,
account state format. The account address format and the account state
format forms a map that defines the world state. A transition rule
defines the way it transfer from one world state to the next world
state. Each transition can also creates additional data defined by the
additional format.

Given a set of transactions, world state after applying all
transactions using the transition rules, the additional data created,
the interface is expected to be able to construct a =non-consensus=
new block. The consensus function is expected to turn that into a
=consensus= new block using its =mine= function.

=etcommon= simply has the transaction format set as =Transaction=,
account address format as =Address=, account state format as
=Account=, transition rule defined as a function using EVM (being
generic in =etcommon=, but we know it's SputnikVM), additional data
defined as =(TransactionReceipt, Vec<Log>)=. Consensus is generic, it
can either be =FakeConsensus= (used by =etestrpc=), or =ethash= (by
=etclient=). We see that =etcommon= reduces the amount of generic
traits to two: consensus and transition rules.

Those rules does not care about parallel execution at all -- it is
expected that transactions are always in sequence, and it's the actual
client's responsibility to implement parallel execution and figure out
the sequence, if needed (if so, world state must allow "merging").

Then for =etestrpc= and =etclient=, the job is to simply use the above
interface to implement an event loop. For =etestrpc=, the event loop
would simply be a timeout that mines a new block every ten
seconds. For =etclient=, the event loop would be using =devp2p=. It is
expected that the actual code in =etestrpc= and =etclient= would be
very short.

   Compiling etcommon-hexutil v0.2.3 (https://github.com/enigmampc/etcommon-rs.git?rev=develop#f229bdd7)                                                                                                                                                                       
error[E0432]: unresolved import `alloc::String`                       ] 11/103: typenum, semver-parser, sgx_build_helper, rayon, etcommon-hexutil                                                                                                                              
  --> /root/.cargo/git/checkouts/etcommon-rs-e1e8f285bcf80a62/f229bdd/hexutil/src/lib.rs:13:13
   |
13 | use alloc::{String, Vec};
   |             ^^^^^^ no `String` in the root. Did you mean to use `string`?

error[E0432]: unresolved import `alloc::Vec`
  --> /root/.cargo/git/checkouts/etcommon-rs-e1e8f285bcf80a62/f229bdd/hexutil/src/lib.rs:13:21
   |
13 | use alloc::{String, Vec};
   |                     ^^^ no `Vec` in the root. Did you mean to use `vec`?

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0432`.

elichai2@elichai2-YOGA-720:~/gits/etcommon-rs/rlp$ cargo build --no-default-features
   Compiling elastic-array-plus v0.9.1
   Compiling etcommon-hexutil v0.2.3 (file:///home/elichai2/gits/etcommon-rs/hexutil)
error[E0554]: #![feature] may not be used on the stable release channel
 --> hexutil/src/lib.rs:2:35
  |
2 | #![cfg_attr(not(feature = "std"), feature(alloc))]
  |                                   ^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0554`.
error: Could not compile `etcommon-hexutil`.
warning: build failed, waiting for other jobs to finish...
error[E0554]: #![feature] may not be used on the stable release channel
 --> /home/elichai2/.cargo/registry/src/github.com-1ecc6299db9ec823/elastic-array-plus-0.9.1/src/lib.rs:2:35
  |
2 | #![cfg_attr(not(feature = "std"), feature(alloc))]
  |                                   ^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0554`.
error: Could not compile `elastic-array-plus`.

To learn more, run the command again with --verbose.

C:\Users\appveyor\.cargo\registry\src\github.com-1ecc6299db9ec823\etcommon-trie-0.3.7\src\merkle\nibble.rs:96:24
   |
96 |             ret[i / 2] |= nibble[i].into();
   |                        ^^
error: aborting due to previous error

[dependencies]
etcommon-bigint = "0.2.9"

extern crate bigint;

[lib]
name = "bigint"