Allow custom rule/rule engine listeners in AbstractRuleEngine

[elitacco]

After #157 there is no way to remove the default rule and rules engine listeners. It should be possible to create a rule engine with a custom list of rule listeners and rule engine listeners.

[okohub]

+1 for this one.

This was a breaking change for us. We are removing default listeners when decorating DefaultRulesEngine.

[zhhaojie]

After #157 there is no way to remove the default rule and rules engine listeners. It should be possible to create a rule engine with a custom list of rule listeners and rule engine listeners.

yes, you can register your custom list of rule listeners & rule engine listeners. but there is no way to remove the default listeners.

i wonder what's the reason you remove the defaults ?

[fmbenhassine]

Default listeners will be removed in next major version (See #223).

I'm closing this issue as a duplicate of #223 .