eo: add move tag to iterator

It is impossible to reuse iterator after `EINA_ITERATOR_FOREACH`(`eina_iterator_next`).

E.g.
```
eina_init();

eina_file_dir_list("/home/", EINA_FALSE, _print_cb, NULL);

it = eina_file_ls("/home/");
EINA_ITERATOR_FOREACH(it, f_name)
  {
     printf("%s\n", f_name);
     eina_stringshare_del(f_name);
  }
EINA_ITERATOR_FOREACH(it, f_name)
  {
     printf("Again %s\n", f_name);
     eina_stringshare_del(f_name);
  }
eina_iterator_free(it);
```
`Agian ...` is never printed.

Therefore, iterator always need `@move` tag to avoid unexpected behavior without
any error message.

Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D10719

src/lib/ecore/efl_boolean_model.eo

@@ -25,7 +25,7 @@ class @beta Efl.Boolean_Model extends Efl.Composite_Model
             @in name: string; [[The name of the property to examine.]]
             @in request: bool; [[The value to look for.]]
          }
-         return: iterator<ptr(uint64)>; [[The iterator that is valid until any change is made on the model.]]
+         return: iterator<ptr(uint64)> @move; [[The iterator that is valid until any change is made on the model.]]
       }
    }
    implements {

src/lib/ecore/efl_core_env.eo

@@ -47,7 +47,7 @@ class @beta Efl.Core.Env extends Efl.Object implements Efl.Duplicate {
 
         }
         values {
-          iter : iterator<string>;
+          iter : iterator<string> @move;
         }
       }
    }

src/lib/efl/interfaces/efl_gfx_image.eo

@@ -217,9 +217,9 @@ interface Efl.Gfx.Image
          }
          get {}
          values {
-            horizontal: iterator<Efl.Gfx.Image_Stretch_Region>(null); [[Representation of areas that are
+            horizontal: iterator<Efl.Gfx.Image_Stretch_Region>(null) @move; [[Representation of areas that are
                 stretchable in the image horizontal space.]]
-            vertical: iterator<Efl.Gfx.Image_Stretch_Region>(null); [[Representation of areas that are
+            vertical: iterator<Efl.Gfx.Image_Stretch_Region>(null) @move; [[Representation of areas that are
                 stretchable in the image vertical space.]]
          }
       }

src/lib/efl/interfaces/efl_ui_view_factory.eo

@@ -10,7 +10,7 @@ class @beta Efl.Ui.View_Factory
          params {
             factory: Efl.Ui.Factory; [[The factory to use for requesting the new object from and generating the created
                                  event onto.]]
-            models: iterator<Efl.Model>; [[Efl iterator providing the model to be associated to the new item. It should
+            models: iterator<Efl.Model> @move; [[Efl iterator providing the model to be associated to the new item. It should
                                      remain valid until the end of the function call.]]
          }
          return: future<Efl.Gfx.Entity>; [[Created UI object]]

src/lib/elementary/efl_access_object.eo

@@ -263,7 +263,7 @@ mixin @beta Efl.Access.Object requires Efl.Object
       }
       relations_get @protected @beta @const {
          [[Gets an all relations between accessible object and other accessible objects.]]
-         return: iterator<ptr(Efl.Access.Relation)>; [[Accessible relation set]]
+         return: iterator<ptr(Efl.Access.Relation)> @move; [[Accessible relation set]]
       }
       @property role @beta {
          [[The role of the object in accessibility domain.]]

src/lib/elementary/efl_ui_focus_manager.eo

@@ -92,7 +92,7 @@ interface Efl.Ui.Focus.Manager {
             ]]
             get {}
             values {
-                border_elements : iterator<Efl.Ui.Focus.Object>; [[An iterator
+                border_elements : iterator<Efl.Ui.Focus.Object> @move; [[An iterator
                    over the border objects.]]
             }
         }
@@ -107,7 +107,7 @@ interface Efl.Ui.Focus.Manager {
                 viewport : Eina.Rect; [[The rectangle defining the viewport.]]
             }
             values {
-              viewport_elements : iterator<Efl.Ui.Focus.Object>; [[An iterator over the viewport border objects.]]
+              viewport_elements : iterator<Efl.Ui.Focus.Object> @move; [[An iterator over the viewport border objects.]]
             }
         }
         @property root {

src/lib/elementary/efl_ui_view_model.c

@@ -183,6 +183,7 @@ _efl_ui_view_model_property_logic_add(Eo *obj, Efl_Ui_View_Model_Data *pd,
         logic->sources = eina_list_append(logic->sources, eina_stringshare_add(source));
         efl_ui_view_model_property_bind(obj, source, property);
      }
+   eina_iterator_free(bound);
 
    return 0;
 }

src/lib/elementary/efl_ui_view_model.eo

@@ -76,8 +76,8 @@ class Efl.Ui.View_Model extends Efl.Composite_Model
                                             with the above property name.]]
             set: EflUiViewModelPropertySet; [[Define the set callback called when the @Efl.Model.property.set is called
                                             with the above property name.]]
-            binded: iterator<string>; [[Iterator of property name to bind with this defined property see
+            binded: iterator<string> @move; [[Iterator of property name to bind with this defined property see
-                                        @.property_bind.]]
+                                              @.property_bind.]]
          }
          return: Eina.Error;
       }

src/lib/elementary/efl_ui_win.eo

@@ -721,7 +721,7 @@ class Efl.Ui.Win extends Efl.Ui.Widget implements Efl.Canvas.Scene, Efl.Access.W
             hover: bool @optional; [[$false by default, $true means to include
                                      fingers that are currently hovering.]]
          }
-         return: iterator<const(Efl.Input.Pointer)>; [[Iterator to pointer positions]]
+         return: iterator<const(Efl.Input.Pointer)> @move; [[Iterator to pointer positions]]
       }
       @property win_rotation @beta {
          [[The rotation of this window