Add limited ability to bind directly to keycodes.

Binding to keycodes is good for nonmnemonic key bindings -- where the
choice of key is due to its position on the keyboard rather than the
character associated with it.

Right now only window bindings and subbindings can use keycode bindings.
Root bindings can still only be keysyms and buttons.

I've been using this feature to map some movement keys to Hyper. This
emulates the function key on my M770 keyboard where fn+ijkl are used as
arrow keys. I use the tab key as my hyper key. With xcape it can operate
as a Tab key when release, or a modifier key when held down, which is
awesome.

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