* Add better password checking, confirm password, feedback, and up the minimum to 12.
* Move wallet generation off to a web worker, and bump up the n value to 8192. Refactor workers a wee bit.
* tscheck cleanup
* Make keystore password a form. Replace text with spinner on load.
* Center align again.
* Hard code n factor of test wallet, fix some misspelled type definitions for IV3Wallet.
1. Attempt an empty password every time a keystore is uploaded.
2. Delegate scrypt decryption (ie ethereumjs-wallet.fromV3) to its own web worker and interface with it through an async typescript function that gets handled in the wallet saga. This keeps the UI unblocked when scrypt takes a long time to decrypt.
3. Add logic to show a spinner x number of milliseconds after file upload so the user will understand when a wallet is being decrypted.