Improve inputs

[mattlenz]

• [x] Disable capitalisation on passphrase
• [x] Separate pin input into four single digit boxes
• [x] Disable capitalisation on Wallet address
• [x] Make Amount inputs type="number"
• [x] Make Gravtar input type="email"

[mattlenz]

Amount inputs can't be type="number", as we won't be able to enter a decimal point.