Added elm_flip_add.
Added elm_flip_front_visible_get.
Added elm_flip_perspective_set.
Added elm_flip_go/go_to.
Added elm_flip_interaction_set/get.
Added elm_flip_interactiond_irection_enabled_set/get.
Added elm_flip_interactiond_irection_hitsize_set/get.
Added new signals.
Added example flip_example_01.