Reject movements from other devices when one device is already down.
This fixes jittery behavior when the user moves the mouse and touches
the screen at the same time.
Change-Id: I99151c8f2596a3139720f776bcbc559d4b314878
Added support for loading the pointer icon from a resource.
Moved the system server related bits of the input manager out
of libui and into libinput since they do not need to be linked into
applications.
Change-Id: Iec11e0725b3add2b905c51f8ea2c3b4b0d1a2d67