needs Recipe Book for various transaction types

- Payments
  - multi-in, single-out
  - multi-in, multi-out
  - transfer all coins
  - sender pays fee
  - receiver pays fee
  - Private Send
  - Cash Send
- Platform Credit Transfer (extrasend)
- Memos
  - Text Message
  - CJ Collateral
  - Burn Memo
- Naive Coin Select
- Optimal Coin Select