added tardfri powerport - gfw dock

devices.py

         self.add(mqtt_client, props.STG_ZGW, loc, roo, props.FUN_INP, props.DTY_TIN_5xx)            # Tradfri Input Device 5 Buttons
         self.add(mqtt_client, props.STG_MYA, loc, roo, props.FUN_MPP, props.DTY_MPP_4xx)            # My 4 port Powerplug
         self.add(mqtt_client, props.STG_ZGW, loc, roo, props.FUN_DEL, props.DTY_TLI_SBT)            # Tradfri Desklight
+        self.add(mqtt_client, props.STG_ZGW, loc, roo, props.FUN_DCK, props.DTY_SPP_SW1)            # Tradfri 1 port Powerplug
         self.add(mqtt_client, props.STG_MYA, loc, roo, props.FUN_RCA, props.DTY_MRE_xxx)            # Remote Control IR Amplifier
         self.add(mqtt_client, props.STG_MYA, loc, roo, props.FUN_ASS, props.DTY_MAS_xxx)            # Audio status Spotify
         self.add(mqtt_client, props.STG_MYA, loc, roo, props.FUN_ASM, props.DTY_MAS_xxx)            # Audio status MPD

topic.py

 """ Audio status mpd """
 FUN_ASB = 18
 """ Audio status bluetooth """
-
+FUN_DCK = 19
+""" Docking Station """
 
 class topic_by_props(UserString):
     def __init__(self, stg, loc, roo, fun):
             FUN_HEA: 'heating_valve',
             FUN_MPP: 'powerplug',
             FUN_INP: 'input_device',
+            FUN_DCK: 'dock',
             FUN_CIR: 'circulation_pump',
             FUN_GAR: 'garland',
             FUN_XTR: 'xmas-tree',