* Initial implementation of AuthCodeStore for SystemUIs

* SystemUIs authorization

* Renaming SystemUI -> SignerUI

* Fixing clippy warnings

* Lowering time threshold

* Bumping sysui

* Fixing test

StateDiff and VMTrace uses serde preprocessor.

Removing compilation warnings

Allowing connections only from chrome-extension and self-hosted client

Clippy bump & fixing warnings

Bumping serde & syntex

Minimal Signer UI (System UI) exposed over websockets.

Switch RPC namespace form ethcore_ to trace_

Verify the state root exists before creating a State

Conflicts:
	dapps/Cargo.toml

Conflicts:
	ethcore/src/types/state_diff.rs

Integrate state diffing into the ethcore JSONRPC

* apps list to separate module

* Preparing to support serving files from disk

* Serving files from disk

* Using dapps path from CLI

* Adding more docs