[M108 Migration][Accessibility] Bringup Accessibility.
- Brings up & Refactoring accessibility in accordance with upstream.
- Make a AXPlatformNodeEfl inherit from AXPlatformNodeAuraLinux
for ATK event/callback.
- Migrate from BrowserAccessibility* to AXPlatformNode*.
- Remove BrowserAccessibilityManagerEfl / BrowserAccessibilityEfl.
- Support value change event.
Reference:
https://review.tizen.org/gerrit/279337
https://review.tizen.org/gerrit/279612
Change-Id: Ie312e18870a5d20304be4b8c5a6b11aa1b23ae33
Signed-off-by: Ayush Kumar <ayush.k123@samsung.com>