Refactoring mouse and touch events support.

Refactoring mouse and touch events support.

Touch events are delivered to webapps inconsistently so we need to press
UI elements several times to make them work.
This patch disables GESTURE_EVENT and TIZEN_LINK_MAGNIFIER for IVI, which may
improve touch event responsiveness. In addition, it allows mouse and touch events
to be generated simultaneously.

This patch includes the following commit again that was reverted.

https://review.tizen.org/gerrit/#/c/13438/

This patch fixes TIVI-1941, TIVI-2380, and TIVI-2082.

Change-Id: I32b32021f675a566206ad563b9fba4ec799b2344