[Bounty] Fix "Known ring does not include the spent output" error and rebase

Why?

Fix the following errors:

"Transaction sanity check failed" and sending fails with "Known ring does not include the spent output: xxxxxxx"

And rebase the Wownero codebase to recent Monero codebase. The above errors seem to be becoming bigger issue for exchanges and miners, so need to fix them and might as well update.

How much?

15000 WOW

What?

See Why?

Milestones?

Community testing and peer review of a ready-to-release updated fork of Wownero can be submitted by anyone

Outcomes?

After community approval the bounty will be paid out to aforementioned anyone

Why you?

What skills and experience do you have? None, this is why we need this bounty.