Add IToolGameEventAPI class

Thanks to komashchenko

public/igameevents.h

@@ -65,6 +65,11 @@ data field should not be broadcasted to clients, use the type "local".
 class KeyValues;
 class CGameEvent;
 
+abstract_class IToolGameEventAPI
+{
+	virtual void unk001( void * ) = 0;
+};
+
 abstract_class IGameEvent
 {
 public:
@@ -131,7 +136,7 @@ public:
 	virtual void FireGameEvent( IGameEvent *event ) = 0;
 };
 
-abstract_class IGameEventManager2 : public IBaseInterface
+abstract_class IGameEventManager2 : public IBaseInterface, public IToolGameEventAPI
 {
 public:
 	virtual	~IGameEventManager2( void ) {};