eo: move Efl_Event definition back to C

It's not used anywhere in eo files and has a void pointer.

src/lib/eo/Eo.h

@@ -216,11 +216,23 @@ typedef void (*Efl_Del_Intercept) (Eo *obj_id);
  */
 typedef Eo Efl_Future;
 
+/**
+ * @typedef Efl_Event
+ * A parameter passed in event callbacks holding extra event parameters.
+ */
+typedef struct _Efl_Event Efl_Event;
+
 #include "efl_object_override.eo.h"
 #include "efl_object.eo.h"
 #include "efl_interface.eo.h"
 #define EO_CLASS EFL_OBJECT_CLASS
 
+struct _Efl_Event {
+   Efl_Object *object; /**< The object the event was called on. */
+   const Efl_Event_Description *desc; /**< The event description. */
+   void *info; /**< Extra event information passed by the event caller. */
+};
+
 /**
  * @addtogroup Eo_Debug_Information Eo's Debug information helper.
  * @{

src/lib/eo/efl_object.eo

@@ -8,16 +8,8 @@ struct Efl.Event.Description {
     restart: bool; [[$true if when the event is triggered again from a callback, it should start from where it was]]
 }
 
-struct Efl.Event {
-     [[Parameter passed in event callbacks holding extra event parameters]]
-     object: Efl.Object; [[The object the event was called on.]]
-     desc: ptr(const(Efl.Event.Description)); [[The event description.]]
-     info: void_ptr; [[Extra event information passed by the event caller.]]
-}
-
 type Efl.Event_Cb: __builtin_event_cb; [[An event callback prototype.]]
 
-
 struct Efl.Callback_Array_Item {
     [[An item in an array of callback desc/func.