Change GetInputDeviceState to return InputDeviceState_NoInputHandler instead of InputDeviceState_Invalid

Rename "_Disconnected" to "_Unplugged"

stepmania/src/RageInput.cpp

@@ -151,7 +151,7 @@ InputDeviceState RageInput::GetInputDeviceState( InputDevice id )
 		}
 	}
 
-	return InputDeviceState_Invalid;
+	return InputDeviceState_NoInputHandler;
 }
 
 RString RageInput::GetDisplayDevicesString() const

stepmania/src/RageInputDevice.cpp

@@ -10,8 +10,9 @@
 
 static const char *InputDeviceStateNames[] = {
 	"Connected",
-	"Disconnected",
-	"MissingMultitap",
+	"Unplugged",
+	"NeedsMultitap",
+	"NoInputHandler",
 };
 XToString( InputDeviceState );
 

stepmania/src/RageInputDevice.h

@@ -77,9 +77,10 @@ struct InputDeviceInfo
 
 enum InputDeviceState
 {
-	InputDeviceState_Connected,
-	InputDeviceState_Disconnected,
-	InputDeviceState_MissingMultitap,
+	InputDeviceState_Connected,	// has an InputHandler and controller is plugged in
+	InputDeviceState_Unplugged,	// has an InputHandler but controller is unplugged or lost wireless link
+	InputDeviceState_NeedsMultitap,	// has an InputHandler but needs a multitap to function
+	InputDeviceState_NoInputHandler,	// there is no InputHandler that implements this InputDevice
 	NUM_InputDeviceState,
 	InputDeviceState_Invalid
 };