e_comp_object: add e_comp_object_effect_hiding_set

e_comp_object: add e_comp_object_effect_hiding_set

ec->frame never hide when it is animating(bg running, restack showing)
if evas object changes its visibility state, comp_obj emit the signal
   show: state,hidden/action,iconify
   hide: state,visible/action,uniconify
if evas stack has changed than, E-mod effect emit the signal
   show: restack,show
   hide: restack,hide
window transition animation(aka effect) is calculated by the e_mod_effect mod.
refering to signals. therefore it is hard to know in e20 side what is animating
By effect mod set hiding state using this api, intercept hide can process
'hide' unless it is not hiding animation.

Change-Id: Ia580f36270463314f16455dd16f6a6bdf4b94b12