## Issue Addressed
NA
## Proposed Changes
Allows for multiple "hardcoded" testnets.
## Additional Info
This PR is incomplete.
## TODO
- [x] Add flag to CLI, integrate with rest of Lighthouse.
Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>
Co-authored-by: Michael Sproul <michael@sigmaprime.io>
* Update state processing for v0.12
* Fix EF test runners for v0.12
* Fix some tests
* Fix broken attestation verification test
* More test fixes
* Fix typo found in review