Not all X keysyms supported

[lesderid]

To be compatible with keynav, key names in key bindings are inherited from X. The current list of keys is enough to support the (built-in) default configuration and the example keynavrc, but it's far from complete.

The key name translation function is essentially just a big messy switch statement and should probably be refactored first.

List of X keysyms (remove XK_ prefix): keysymdef.h
List of Windows virtual-key codes: winuser.h documentation

(Note that it's not a perfect one-to-one mapping.)