Summary of actions performed:

* App.js routes
	* AccountsList
		* New functionality - `<RequireHealthOverlay require='connected-offline'>`
			* Note: we need to be connected even for the AccountsList page since most accounts actually come from parity-ethereum (as pointed out by @amaurymartiny). New functionality (@amaurymartiny proposal) uses additional 'connected-offline' state so if we are connected to the node but not to the internet we can show the AccountsList page
	* Accounts (token list page)
		* Retain existing functionality - `<RequireHealthOverlay require='sync'>`
	* Create Account / Import Account
		* New functionality - `<RequireHealthOverlay require='connected-offline'>`
	* Backup Account
		* New functionality - `<RequireHealthOverlay require='connected-offline'>`
	* Onboarding
		* New functionality - no overlay since not wrapping App.js
	* Search tokens (Whitelist)
		* Retain existing functionality - `<RequireHealthOverlay require='sync'>`
* Send.js routes
	* TxForm, Unlock, TxQrCode, ScanSignedTx, SignedTxSummary
		* Retain existing functionality - `<RequireHealthOverlay require='sync'>`
	* Sent
		* Retain existing functionality by wrapping the individual component instead of App.js with: `<RequireHealthOverlay require='connected' fullscreen>`

* Note: `RequireHealthOverlay` has two states:
		* `require='connected-offline` no alert/overlay when user connected to a local node but not connected to the internet
		* `require='connected'` shows full screen alert when the user is not connected to the node and and not connected to the internet
		* `require='sync'` shows when the user is not sync
* Note: Only the Sent component has a fullscreen overlay
* Note: This wraps everything related to eth/token/balance/transfer with `require='sync'`
* Note: We are not wrapping App.js anymore since when using both `<RequireHealthOverlay require='connected' fullscreen>` in addition to wrapping other components such as Accounts.js with `<RequireHealthOverlay require='connected-offline'>` doesn't allow it. Instead just wrap individual components

for good measure

- Add option to import a Parity Signer account. It is then stored in
local storage.

- Send transactions with Parity Signer accounts

- Refactor sendStore so that "token" (and chainId) is inside this.tx;
avoids having to pass `token` around every function, and it makes sense
to put it in the object since it is part of the tx info.

- Add account type (either node or signer) to accountsInfo

- Add account type to withAccount; output props are now `{account:
{address, type}}` instead of `{accountAddress}`

* Create TxDetails component and move relevant instance methods from TxForm into TxDetails

* Fix linting warning `Using target="_blank" without rel="noopener noreferrer" is a security risk: see https://mathiasbynens.github.io/rel-noopener`