* Refactoring signature-request out to a new component. Wip
* Styling polish and a better message display.
* Update signature request header to no longer use account dropdown mini
* Clean up code and styles
* Code cleanup for signature request redesign branch
* Fix signature request design for full screen
* Replace makenode with object.entries in signature-request-message.component.js
* Remove unused accounts prop from signature-request.component.js
* Use beforeunload instead of window.onbeforeunload in signature-request
The `accounts` prop of `SignatureRequest` was throwing a PropType
warning because `accounts` was an object instead of an array. It looks
like when the `mergeProps` function was added in #6340, the ownProps
were accidentally set to override the state props.
The now ignored props have been removed from the parent `ConfirmTxScreen`
component as well. `conversionRate` was identical to the one retrieved
in `SignatureRequest`, and `selectedAddress` differed only in the
fallback behaviour when `state.metamask.selectedAddress` does not exist;
it will now default to the first account instead (as was the original
behavior, prior to #6340).
