Add support for Ripple

[hewigovens]

Name: Ripple
HD Derivation Scheme: BIP44 / 144
Symbol: XRP

Reference:
Base58

Checklist

• Coin configuration
• • coin type / decimals
• • recommended tx block explorer (bithomp)
• Account / Address (https://developers.ripple.com/accounts.html)
• • derived from bip39 phrases
• • from public key / string
• • validation
• • C interfaces
• • unit test
• Transaction (https://developers.ripple.com/transaction-basics.html)
• • serialization
• • signing
• • C interfaces
• • unit test
• Integration
• • Validate generated code in iOS projects
• • Validate generated code in Android projects
• • Swift integration test
• • Java integration test