Win32 input device refinements and XInput support

InputDeviceClasses.cpp

@@ -1,6 +1,7 @@
 #include "boo/inputdev/DeviceSignature.hpp"
 #include "boo/inputdev/DolphinSmashAdapter.hpp"
 #include "boo/inputdev/DualshockPad.hpp"
+#include "boo/inputdev/XInputPad.hpp"
 
 namespace boo
 {
@@ -9,6 +10,7 @@ const DeviceSignature BOO_DEVICE_SIGS[] =
 {
     DEVICE_SIG(DolphinSmashAdapter, 0x57e, 0x337, DeviceType::USB),
     DEVICE_SIG(DualshockPad, 0x54c, 0x268, DeviceType::HID),
+    DEVICE_SIG(XInputPad, 0, 0, DeviceType::XInput),
     DEVICE_SIG_SENTINEL()
 };