Introduce invalid area

Introduce invalid area

This patch absorbs the forked git commit below.
https://github.sec.samsung.net/Tizen-DA/e-mod-tizen-screen-reader/commit/aae916a292f2c36f91812a5d3da87fbd04f49904

Above commit and forked git could be removed by this patch introducing
the invalid area.

To make invalid area have size, we need following change.

e-tizen-data/default/config/tizen-mobile/module.screen_reader.accessibility.src

 group "Screen_Reader_Accessibility_Config" struct {
       value "gesture.quickpanel_area_size" uint: 40;
       value "gesture.longpress_timeout" float: 0.4;
+      value "gesture.invalid_area_size.top" uint: 70;
+      value "gesture.invalid_area_size.bottom" uint: 50;
 }

Change-Id: I2995ec5356993c430ec6ff072dcba8dcc7bab1aa