* Added test vectors deleted from #81
* Fixed dlc_test redeemscript and added new dlc message parsing tests
* Fixed chain_hash endianness
* Added Schnorr signature point computation test vectors
* Restructured contract info json
* Restructured signature TLVs dlc_message_test.json
* UInt16 prefixed scripts and added hash pre-images to test vectors
* Added Nicolas' tests for NFC normalization and hashing
* Added dlc fee computation tests
* Added clarification to redeemscript in funding_input_v0 wrt fee computation
* Added basic tx building tests
* Updated test vectors to use 107 witness bytes for P2WPKH
* Updated test vectors to include non-p2wpkh inputs as well as dummy scripts to be used in fee tests for less modular APIs
* Added maxWitnessLen to inputs explicitly
* Fixed order and serialization of signatures
* Fixed backward stack funding signatures
