v0.8.30: implement pending items limit

Improve message item management
Implement pending items limit

v0.8.29

Re-add support for adding general event callbacks

v0.8.28

v0.8.28 adds primary_feature_type

v0.8.27

Add defensive check

v0.8.26

Improve response handling

v0.8.25 - Refactor

Moderate refactor, startup performance improved.

v0.8.24 - Initial release for renamed project

Initial release