* Enable frozen_abi on banking trace file
* Fix ci with really correct bugfix...
* Remove tracker_callers
* Fix typo...
* Fix AbiExample for Arc/Rc's Weaks
* Added comment for AbiExample impl of SystemTime
* Simplify and document EvenAsOpaque with new usage
* Minor clean-ups
* Simplify SystemTime::example() with UNIX_EPOCH...
* Add comment for AbiExample subtleties