Transaction confirm component.

[lbrendanl]

This is a new component that will exist in the purchase flyover and in the update auction price component.

It will be shown immediately after confirming or cancelling a metamask transaction.

• On a cancel, a generic cancel message is shown to the user (no need to try and revert to previous state).
• On a confirm, a spinner appears until the transaction has been broadcast to the network.
• Once that happens, a link to etherscan with that transaction appears.