eo: remove Efl_Event definition (replace with builtin)

src/lib/ecore/efl_threadio.eo

@@ -3,14 +3,14 @@ import efl_object;
 function @beta EFlThreadIOCall {
    [[ A Function to call on the "other end" of a thread obvject ]]
    params {
-      @cref event: Efl.Event; [[ ]]
+      @in event: const(event); [[ ]]
    }
 };
 
 function @beta EFlThreadIOCallSync {
    [[ A Function to call on the "other end" of a thread obvject ]]
    params {
-      @cref event: Efl.Event; [[ ]]
+      @in event: const(event); [[ ]]
    }
    return: void_ptr; [[ ]]
 };

src/lib/elementary/efl_ui_widget.eo

@@ -174,7 +174,7 @@ abstract Efl.Ui.Widget extends Efl.Canvas.Group implements Efl.Access.Object,
            makes sure other widgets will not also process this input event.
          ]]
          params {
-            @cref eo_event: Efl.Event;
+            @in eo_event: const(event);
                [[EO event struct with an Efl.Input.Event as info.]]
             @in source: Efl.Canvas.Object;
                [[Source object where the event originated. Often same as this.]]

src/lib/eo/efl_object.eo

@@ -437,17 +437,3 @@ abstract Efl.Object
          reference you keep to the object.]]
    }
 }
-
-struct @extern Efl.Event {
-    [[A parameter passed in event callbacks holding extra event parameters.
-
-      This is the full event information passed to callbacks in C.
-    ]]
-    object: Efl.Object; [[The object the callback was called on.]]
-    desc: const(ptr(Efl.Event_Description)); [[The event description.]]
-    info: void_ptr; [[Extra event information passed by the event caller.
-      Must be cast to the event type declared in the EO file. Keep in mind that:
-      1) Objects are passed as a normal Eo*. Event subscribers can call functions on these objects.
-      2) Structs, built-in types and containers are passed as const pointers, with one level of indirection.
-    ]]
-}