onCollision() {
		if (this.name === "Trigger") {
			this.triggerEvent.apply(this);
		}
		return false;
	}
onCollision callback, triggered in case of collision with this trigger
@param {ResponseObject} response - the collision response object
@param {Renderable} other - the other renderable touching this one (a reference to response.a or response.b)
@returns {boolean} true if the object should respond to the collision (its position and velocity will be corrected)