one line import #420 (#447)

* one line import #420

Example:

    import ev3dev2.auto as ev3

    ts = ev3.TouchSensor(ev3.INPUT_1)

Author: dwalton76

ev3dev2/auto.py

@@ -0,0 +1,47 @@
+from ev3dev2 import *
+
+platform = get_current_platform()
+
+if platform == 'ev3':
+    from ev3dev2._platform.ev3 import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.ev3 import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.ev3 import LEDS, LED_GROUPS, LED_COLORS
+
+elif platform == 'evb':
+    from ev3dev2._platform.evb import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.evb import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.evb import LEDS, LED_GROUPS, LED_COLORS
+
+elif platform == 'pistorms':
+    from ev3dev2._platform.pistorms import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.pistorms import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.pistorms import LEDS, LED_GROUPS, LED_COLORS
+
+elif platform == 'brickpi':
+    from ev3dev2._platform.brickpi import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.brickpi import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.brickpi import LEDS, LED_GROUPS, LED_COLORS
+
+elif platform == 'brickpi3':
+    from ev3dev2._platform.brickpi3 import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.brickpi3 import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.brickpi3 import LEDS, LED_GROUPS, LED_COLORS
+
+elif platform == 'fake':
+    from ev3dev2._platform.fake import INPUT_1, INPUT_2, INPUT_3, INPUT_4
+    from ev3dev2._platform.fake import OUTPUT_A, OUTPUT_B, OUTPUT_C, OUTPUT_D
+    from ev3dev2._platform.fake import LEDS, LED_GROUPS, LED_COLORS
+
+else:
+    raise Exception("Unsupported platform '%s'" % platform)
+
+from ev3dev2.button import *
+from ev3dev2.display import *
+from ev3dev2.fonts import *
+from ev3dev2.led import *
+from ev3dev2.motor import *
+from ev3dev2.port import *
+from ev3dev2.power import *
+from ev3dev2.sensor import *
+from ev3dev2.sensor.lego import *
+from ev3dev2.sound import *