ENYO-1864: fix positioning of pinned mode item during scrolling

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)
ENYO-1807, ENYO-1793: Prevent dragstart event propagation when in reordering mode.  This keeps panels from reacting and also stops swipe code from activating during a reorder

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)