Currently Xorg uses hal's fdi files to decide what configuration options
are applied to automatically added input devices. This is sub-optimal
since it requires users to use a new and different configuration store
than xorg.conf.

The InputClass section attempts to provide a system similar to hal where
configuration can be applied to all devices with certain attributes. For
now, devices can be matched to:

* A substring of the product name via a MatchProduct entry
* A substring of the vendir name via a MatchVendor entry
* A pathname pattern of the device file via a MatchDevicePath entry
* A device type via boolean entries for MatchIsKeyboard, MatchIsPointer,
  MatchIsJoystick, MatchIsTablet, MatchIsTouchpad and MatchIsTouchscreen

See the INPUTCLASS section in xorg.conf(5) for more details.

Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>