Added OutputReference and introduced public key computation on SPKs
Made InputInfo into an ADT
Made UTXOSpendingInfo use InputInfo
Replaced UTXOSpendingInfo with NewSpendingInfo and got non-test things compiling
Made aliases for (NewSpendingInfo/NewSpendingInfoFull/NewSpendingInfoSingle)[InputInfo]
Got rid of source code mention of UTXOSpendingInfo
sbt compile passes
tests compile
Fixed all coreTest tests
Renamed to UTXOInfo
Some cleanup
Moved redeem script and script witness accessors to companion object
Responded to code review
Added OutputReference and scaladocs
Moved p2pkhPreImageOpt downstream and generalized to hashPreImages
Fixed adding-spks.md
Fixed psbts.md and txbuilder.md
Renamed UTXOInfo
Apply renaming to docs
* 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
