coordinate z-index CSS to minimize composite layers

Issue: ENYO-527
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
disable animation for SimplePicker when acceleration is globally disabled

Issue: ENYO-527
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)