* 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
* Added a document explaining how to add new script types.
* built website
* Added a doc explaining the differences between full and single signing
* Added design philosophy section
* Responded to review
* mdoc now compiles the code within adding-spks.md, with some caveats surrounding sealed traits
* Added explanitory comment
