* Refactored Transaction
Created RawTxBuilder
Created RawTxFinalizer as layer on top of RawTxBuilder
Introduced RawTxSigner and replaced TxBuilder!
Deleted TxBuilder!
* fixed things after rebase
* Made RawTxBuilder compatible with older versions of scala
* Began responding to review
* Made Finalizer take a Builder rather than the other way around
* Added composition for finalizers
* Ran scalafmt
* Updated txbuilder example documentation
* Moved tests from old TxBuilderTest files to relevant new test files
* Added scaladocs
* Added crypto project and decoupled BitcoinSLogger from NetworkElement
Decoupled BitcoinSLogger from Factory
Moved NetworkElement into crypto project
Moved Factory and BitcoinSUtil (renamed to BytesUtil) to crypto project
Moved MaskedToString to crypto project
Added BytesUtil to imports and cleaned up CryptoUtil.recoverPoint
Moved the rest of crypto stuff to the crypto project
Moved crypto tests to crypto-test project
* Added documentation for crypto project
