Added

• option to add Actor event handlers which accept no arguments
• added support for is_terminal flag in status message update
• option to set status message along with Actor.exit()

Fixed

• fixed saving key-value store values to local storage with the right extension for a given content type
• started enforcing local storage to always use the UTF-8 encoding

Internal changes

• switched from setup.py to pyproject.toml for specifying project setup