Add test cases to test new bitcoin-tx functionality

This commit add testcases to test the following functions in bitcoin-tx:

- add a pay to non-standard script output
- add a P2SH output
- add a P2WSH output
- add a P2WSH wrapped in a P2SH output
- add a pay to pub key output
- add a P2WPKH output
- add a P2WPKH wrapped in a P2SH output
- add a bare multisig output
- add a multisig in P2SH output
- add a multisig in a P2WSH output
- add a multisig in a P2WSH wrapped in as P2SH output

src/test/data/txcreatescript2.hex

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+010000000001000000000000000017a91471ed53322d470bb96657deb786b94f97dd46fb158700000000