Only calculate owner addresses once per block

[Bushstar]

Summary

• Only calculate owner addresses once per block. Addition of a set of CScript addresses added to CCustomCSView in ConnectBlock. When addresses are calculated they are added to this set, before calculating addresses this set is checked if it already contains the address and can then skip doing it again.

Implications

• Storage

  • [ ] Database reindex required
  • [ ] Database reindex optional
  • [ ] Database reindex not required
  • [x] None

• Consensus

  • [ ] Network upgrade required
  • [ ] Includes backward compatible changes
  • [ ] Includes consensus workarounds
  • [ ] Includes consensus refactors
  • [x] None