A working callback mechanism between C and Scheme code.

Callbacks can be fully setup via Scheme code; the C code assumes
callbacks have no args and return no values. Within Scheme we setup
callbacks via some lambda functions that capture args when needed (see
make-callback example).

Key press handler operates on the C side using a hash map to find the
callback to be called. Everything is set up on the Scheme side, which
is less verbose and more convenient to read.

* main.scm: Setup callbacks for keypresses
* schewm.c: Callbacks hash maps for keys and buttons, handlers for
keys
* wm.scm: Minor reorganization (key grab also now takes the callback
directly)

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