/** `RemoveListener()` : **`function`**
*
* Corollary to the `AddListener()` function.
**/
public virtual void RemoveListener(Thing thing) =>
ViewEvent -= thing.View;
/** `AddListener()` : **`function`**
*
* Every instantiated `Thing` calls if it detects the
* `Player` is nearby via `OnTriggerEnter()`. It then
* subscribes itself to or unsubscribes itself from the
* global/static `Thing`, acts as an event handler to
* the instances. Subscribers could have any number of
* functions called iff the `Player` is nearby and the
* `Player` issues an appropriate command.
**/
public virtual void AddListener(Thing thing) =>
ViewEvent += thing.View;