* Copy modal from keepkey branch and generalize

The keepkey PinMatrix modal needs to be the same for Trezor, but we
should probably try to keep it general since it can be used for both.

* Add trezor communication code

This is a result of much trial-and-error and a couple of dead-ends in
how to communicate and wire everything up.

Code here is still a bit WIP with lots of debug prints and stuff.

The test works though, it is possible to sign a transaction.

* Extend the basic lib to allow Trezor

This is kind of ugly and needs some cleanup and generalization. I’ve
just copy-pasted some things to bring in the trezor wallets. I’ve also
had to add a lock to the USB API so that only one thing talks to the
USB at once.

* Add RPC plumbing needed

We need to be able to get “locked” devices from the frontend to figure
out if we’re going to display the PinMatrix or not. Then we need to be
able to send a pin to a device.

* Add logic to query backend for Trezor and display PinMatrix

There’s a bug somewhere here because signing a transaction fails if you
take too long to press the confirm button on the device.

* Change back to paritytech branch

As my fork has been merged in.

* Converting spaces to tabs, as it should be

* Incorporate correct handling of EIP-155

Turns out the Trezor was adjusting the v part of the signature, and
we’re already doing that so it was done twice.

* Some circular logic here that was incorrect

BE-encoded U256 is almost the same as RLP encoded without the
size-byte, except for <u8 sized values. What’s really done is
BE-encoded U256 and then left-trimmed to the smallest size. Kind of
obvious in hindsight.

* Resolve issue where not clicking fast enough fails

The device will not repeat a ButtonRequest when you read from it, so
you need to have a blocking `read` for whatever amount of time that you
want to give the user to click. You could also have a shorter timeout
but keep retrying for some amount of time, but it would amount to the
same thing.

* Scan after pin entry to make accepting it faster

* Remove ability to cancel pin request

* Some slight cleanup

* Probe for the correct HID Version to determine padding

* Move the PinMatrix from Accounts to Application

* Removing unused dependencies

* Mistake in copying over stuff from keepkey branch

* Simplify FormattedMessage

* Move generated code to external crate

* Remove ethcore-util dependency

* Fix broken import in test

This test is useless without a connected Trezor, not sure how to make
it useful without one.

* Merge branch 'master' into fh-4500-trezor-support

# Conflicts:
#	rpc/src/v1/helpers/dispatch.rs

* Ignore test that can't be run without trezor device

* Fixing grumbles

* Avoiding owning data in RPC method
* Checking for overflow in v part of signature
* s/network_id/chain_id
* Propagating an error from the HID Api
* Condensing code a little bit

* Fixing UI.

* Debugging trezor.

* Minor styling tweak

* Make message type into an actual type

This makes the message type that the RPC message accepts into an actual
type as opposed to just a string, based on feedback. Although I’m not
100% sure this has actually improved the situation.

Overall I think the hardware wallet interface needs some refactoring
love.

* Split the trezor RPC endpoint

It’s split into two more generic endpoints that should be suitable for
any hardware wallets with the same behavior to sit behind.

* Reflect RPC method split in javascript

* Fix bug with pin entry

* Fix deadlock for Ledger

* Avoid having a USB lock in just listing locked wallets

* Fix javascript issue (see #6509)

* Replace Mutex with RwLock

* Update Ledger test

* Fix typo causing faulty signatures (sometimes)

* *Actually* fix tests

* Update git submodule

Needed to make tests pass

* Swap line orders to prevent possible deadlock

* Make setPinMatrixRequest an @action