#29 Add handling of degenerate event devices

[Nikolai Kondrashov]

Add handling of degenerate event devices, such as Waltop scroll wheels either to the xorg-server-core or to xf86-input-evdev.

Waltop scroll wheel devices only have vertical and sometimes horizontal scroll wheel reports. This makes them not match any evdev catch-all classes in the default configuration.

This could be resolved by adding match-no-type class to the default xf86-input-evdev configuration, or making xorg-server-core match them to some type.

Peter Hutterer needs to be consulted on this matter.