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Binder classes handling

The followings are checked in this demo:

• inheritence must work with event binder classes.
• If the constructors of the binder class set up variables on this.XX, these will be properties of the _instance_, not that of the class.
• If two events are bound on the same binder class, they are considered the same class in the registry. That is, if the events are bound on the same instance id (or the singleton), they will see a shared state.

logger

When you click button alpha1, logging of count should start from 50. When you click beta1 or beta2, counting starts from 100. Alpha and beta are independent, but beta1 and beta2 share the same clicking state.