async++, small powerstrip improvements (#46)

* async++, small powerstrip improvements

* use asyncclick instead of click, allows defining the commands with async def to avoid manual eventloop/asyncio.run handling
* improve powerstrip support:
  * new powerstrip api: turn_{on,off}_by_{name,index} methods
  * cli: fix on/off for powerstrip using the new apis
* add missing update()s for cli's hsv, led, temperature (fixes #43)
* prettyprint the received payloads when debug mode in use
* cli: debug mode can be activated now with '-d'

* update requirements_test.txt

* remove outdated click-datetime, replace click with asyncclick

* debug is a flag

* make smartstripplug to inherit the sysinfo from its parent, allows for simple access of general plug properties

* proper bound checking for index accesses, allow controlling the plug at index 0

* remove the mess of turn_{on,off}_by_{name,index}, get_plug_by_{name,index} are enough.

* adapt cli to use that
* allow changing the alias per index

* use f-strings consistently everywhere in the cli

* add tests for get_plug_by_{index,name}

kasa/smartdevice.py

@@ -122,7 +122,7 @@ class SmartDevice:
 
         self.protocol = TPLinkSmartHomeProtocol()
         self.emeter_type = "emeter"
-        _LOGGER.debug("Initializing %s", self.host)
+        _LOGGER.debug("Initializing %s of type %s", self.host, type(self))
         self._device_type = DeviceType.Unknown
         self._sys_info: Optional[Dict] = None