Remove Init* classes
Use Gradle distro with sources for IDEA tooling
Implement basic key mgmt and address operations
Introduce Lombok for toString/equals/hashCode gen
Rename Address#get{KeyHash=>Value}
Introduce KeyHash and KeyPairGenerator abstractions
Rename {Basic=>Simple}Address
Extract class AbstractAddress
Introduce TransactionOutput
Introduce TransactionInput
Introduce Transaction
Introduce Ledger, InMemoryLedger
Introduce Ledger#add, add toString/equals/hashCode
Introduce Wallet
Repackage {spc=>bit.ledger}