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* remove outdated click-datetime, replace click with asyncclick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/tests/conftest.py

@@ -92,13 +92,12 @@ def dev(request):
     Provides a device (given --ip) or parametrized fixture for the supported devices.
     The initial update is called automatically before returning the device.
     """
-    loop = asyncio.get_event_loop()
     file = request.param
 
     ip = request.config.getoption("--ip")
     if ip:
-        d = loop.run_until_complete(Discover.discover_single(ip))
-        loop.run_until_complete(d.update())
+        d = asyncio.run(Discover.discover_single(ip))
+        asyncio.run(d.update())
         print(d.model)
         if d.model in file:
             return d
@@ -125,7 +124,7 @@ def dev(request):
         model = basename(file)
         p = device_for_file(model)(host="123.123.123.123")
         p.protocol = FakeTransportProtocol(sysinfo)
-        loop.run_until_complete(p.update())
+        asyncio.run(p.update())
         yield p