Refactoring to use more precise statements when calculating gesture

distance and others

1) Use more precise statements when calculating gesture distance
and refine ACTION_CANCEL motion events and others.

2) Check system property "ro.support_one_handed_mode" to enable or
disable one-handed quicksteps gesture feature.

Bug: 160315874

Test: make and install
Test: manual enable one handed mode and swipe down to trigger
Test: manual start one handed and rotate device
Change-Id: Ib27f9b6f92edda3cbff1ecb554b1a70f2e56e552