Extract Values to their dedicated file
Remove Method and Attribute import in api
Make specific events object for each event
Temporary use Value attribute "event_types"
Add visitors to Named
Add a visitor pattern to handler and notify method to trigger events without knowing event class
Remove unused decorator Subject on attribute and method descriptors
Rename attribute to "default"
Remove "event_types" attribute on Values and classes InstanceHandler replaced by specific event handlers
Added visitor to change default event class