v5.0.0-alpha.3

Fixies a number of issues, most notably removing references to observables which are no longer used in the codebase. They have been superseded by the RBA object (which in turn has its own message, victim, and threat objects).
Some additional bugs were resolved around this removal and introduction of the new RBA field which happened in the first alpha.
Finally, some code cleanup (formatting and linting).

This is still a pre-release and not intended for public use at this time.

What's Changed

• lint fixes & formatting by @ljstella in #350
• removing code referencing observables by @ljstella in #352
• Fixes for 5.0.0a2 by @ljstella in #351
• Version bump for next alpha release by @ljstella in #354

Full Changelog: v5.0.0-alpha.2...v5.0.0-alpha.3