SRV_Channel: add neopixel as an output type

libraries/SRV_Channel/SRV_Channel.h

@@ -143,6 +143,10 @@ public:
         k_scripting14           = 107,
         k_scripting15           = 108,
         k_scripting16           = 109,
+        k_LED_neopixel1         = 120,
+        k_LED_neopixel2         = 121,
+        k_LED_neopixel3         = 122,
+        k_LED_neopixel4         = 123,
         k_nr_aux_servo_functions         ///< This must be the last enum value (only add new values _before_ this one)
     } Aux_servo_function_t;