Public version now available

This is a minimalist and stable version of a simple event system that can be increased in complexity over time.

I have in mind to expand with:

• On ActionEmitter being able to send actions as a queue waiting for all of them to finish processing to react.
• More information signals in the ActionInteractor
• Hooks on ActionListener and ActionEmitter (I still have to think about it)

I hope this first version is useful and don't hesitate to open an issue to clarify the plugin usage.