dix: remove all but main() from main.c

All other functions are pushed into where they seemed to fit.
main.c is now linked separately into libmain.a and linked in by the various
DDXs.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

dix/events.c

@@ -273,6 +273,12 @@ static struct {
 static xEvent* swapEvent = NULL;
 static int swapEventLen = 0;
 
+void
+NotImplemented(xEvent *from, xEvent *to)
+{
+    FatalError("Not implemented");
+}
+
 /**
  * Convert the given event type from an XI event to a core event.
  * @param[in] The XI 1.x event type.