MnemonicBuilder+test: constructs base public interface to generically handle mnemonic generation
BasicMnemonicBuilderSpi+test: adds a base implementation with some routine details etched out to reduce re-implementation.
MnemonicDecoder+test: constructed mnemonic decoder support
LegacyElectrumMnemonic+test: reworks legacy Electrum mnemonic system into new API
docs: updates code comments and some generic cleanup
Merge branch 'feature/apiStandardization' into develop

* feature/apiStandardization:
  docs: updates code comments and some generic cleanup
  LegacyElectrumMnemonic+test: reworks legacy Electrum mnemonic system into new API
  MnemonicDecoder+test: constructed mnemonic decoder support
  BasicMnemonicBuilderSpi+test: adds a base implementation with some routine details etched out to reduce re-implementation.
  MnemonicBuilder+test: constructs base public interface to generically handle mnemonic generation