Closes#379
- `TransactionDetailView` is updated and instead of `ViewStore` it now has `Store`. `Store` is required to show alert. It's not possible with `ViewStore`.
- There are three more actions added to `WalletEventsFlowAction`. These are used to handle the new alert.
- Block explorer URL is changed to https://zcashblockexplorer.com. New URL scheme is derived from how URLs looks now when some transaction is opened.