add basic D-BUS configuration mechanism

Also move LookupDeviceIntRec into the DIX, and add InputOption type, and
NewInputDeviceRequest prototype (DIX requests DDX to add a device).  Does not
link without an implemented NIDR.

include/input.h

@@ -163,6 +163,12 @@ extern void ResetDevicePrivateIndex(void);
 extern KeybdCtrl	defaultKeyboardControl;
 extern PtrCtrl		defaultPointerControl;
 
+typedef struct _InputOption {
+    char                *key;
+    char                *value;
+    struct _InputOption *next;
+} InputOption;
+
 extern DeviceIntPtr AddInputDevice(
     DeviceProc /*deviceProc*/,
     Bool /*autoStart*/);
@@ -366,4 +372,11 @@ extern void InitInput(
     int  /*argc*/,
     char ** /*argv*/);
 
+/* Implemented by the DDX. */
+extern int NewInputDeviceRequest(
+    InputOption *options);
+
+extern DeviceIntPtr LookupDeviceIntRec(
+    CARD8 deviceid);
+
 #endif /* INPUT_H */