Add shortcut methods for triggers

[michalsustr]

I see a lot of examples have code like

this.trigger( CTrigger.from( ITrigger.EType.ADDGOAL, CLiteral.from( "vehicle/collision" ) ) );

Can it be simplified to something like

this.addGoal("vehicle/collision");

(eg add new method to IBaseAgent)

[flashpixx]

With your proposal I'm mixing agent execution with trigger data, because I must implement for each enum typ in EType a method, so if I extend the enum, I must also extend the agent methods. That is not possible, but I think I can add a method build( ILiteral p_literal ) to the enum type, so that the CTrigger.from can be removed

[flashpixx]

fixed for the next release