xproto: Add PointEventMask and DeviceEventMask
The X11 core protocol actually has three different kinds of event masks. See SETofPOINTEREVENT and SETofDEVICEEVENT in 1. xproto.xml currently only has which corresponds to SETofEVENT in 1.
This commit adds the PointerEventMask and DeviceEventMask enums and uses them where appropriate in the XML.
Fixes: #22 Signed-off-by: Uli Schlachter psychon@znc.in