Fix Ecore Handler

Fix Ecore Handler

Setting Ecore events is separated from Init() method to prevent a crash issue.
If the ecore_wl2_shutdown() is called before app_terminate_cb() call,
the application will be crashed by that. While calling the ecore_wl2_shutdown(),
resources related to the wayland are released.
Currently, the indicator application has crashed when calling
the tzsh_indicator_service_destroy(). Because, it's released by the EcoreHandler::Fini().
The EcoreHandler::SetEvents() and the EcoreHandler::UnsetEvents() are added.

Change-Id: Ic153709518b24e4083688d1ccffb37e44c835a66
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>