Wallet CLI tool

[lrettig]

• make sure wallet format is compatible (with smapp, other standards) (Document wallet format #213, SMIP: Spacemesh Reference Wallets - File Format and Accounts Derivation SMIPS#17)
• CLI tool hardware wallet support (Hardware wallet support smcli#10)
• update spacemesh ledger app address format (Update address format ledger-app#5)
• update spacemesh ledger app tx format (can do this later) (Update tx format ledger-app#6)
• support for generating multiple derived keys (Allow generation of multiple derived addresses smcli#11)

[lrettig]

Main genesis-critical tasks are done here. Will handle the rest in #230 and linked issues.