- Split INITIALIZING state into Init+Bind+Connect
- Remove PAUSE state
- Convert state/transitions to enum classes (CamelCase)
- Transition to a state only once previous handler is complete
- Add CompleteInit transition to notify Initializing state
that config updates are complete
- Deprecate WaitForEndOfState(transition) in favor of
WaitForState(state)/WaitForNextState()
- Update tests/plugins to new APIs
- Deprecate CheckCurrentState() in favor of NewStatePending()
the patch seems big but most of it is just propagating the new notion of
constness of the factory - since it keeps track of created messages with
the internal allocator it no longer is const
