[WidgeApplication] Modify WidgetBase internal Id memeber to property (#546)
* Modify WidgetBase internal Id memeber to protected
- support widget_app_get_id
Signed-off-by: hyunho <hhstark.kang@samsung.com>
* Remove test code
Signed-off-by: hyunho <hhstark.kang@samsung.com>
* Modify WidgetBase id to property
Signed-off-by: hyunho <hhstark.kang@samsung.com>
* Use auto generated property
Signed-off-by: hyunho <hhstark.kang@samsung.com>
* Add feature documentation
Signed-off-by: hyunho <hhstark.kang@samsung.com>