Using the witness rework from ZERO PR - modify to not use a new database

[blondfrogs]

• This could fix the issue where we are unable to invalidate more than 29 blocks without a segfault occuring.

[TheTrunk]

29 blocks is most likely tied to our protection of not allowing this long reorganisations. It may be 29 blocks instead of 30.

[blondfrogs]

29 blocks is most likely tied to our protection of not allowing this long reorganisations. It may be 29 blocks instead of 30.

I wish. it is instead an issue with the sapling caching system. and zcash still has this problem.

The PR in WIP does fix this i am pretty sure, but does remove backwards capabilities of wallets.