t1000 cleanup + move NullDisplayDriver.h to helpers/ui for other variants to use

variants/t1000-e/t1000e_sensors.h

@@ -1,7 +1,8 @@
 #pragma once
+#include <stdint.h>
 
 // Light and temperature sensors are on ADC ports
-// functions adapted from Seeed examples to get values 
+// functions adapted from Seeed examples to get values
 // see : https://github.com/Seeed-Studio/Seeed-Tracker-T1000-E-for-LoRaWAN-dev-board
 
 extern uint32_t t1000e_get_light();