Add support for HAL-based hotplugging, in which we just get the list of
input devices and properties from HAL. Requires an FDI which is not yet
in mainline HAL.
Break up D-Bus into two components: a D-Bus core that can be used by any
part of the server (for the moment, just the D-Bus hotplug API, and the
forthcoming HAL hotplug API), and the old D-Bus hotplug API.
Also move LookupDeviceIntRec into the DIX, and add InputOption type, and
NewInputDeviceRequest prototype (DIX requests DDX to add a device). Does not
link without an implemented NIDR.