Remove segwit code

[azuchi]

In tapyrus, we do not use segwit, but some segwit code still remain. In particular, some test code depends on segwit-based test data, so segwit is enabled only during testing.

For future maintenance, it is necessary to remove segwit code and migrate test data.

[Naviabheeman]

#153 - removes witness code from most wallet features.

[Naviabheeman]

• [x] Remove witness support from wallet.
• [ ] Remove vsize and weight from tapyrus.