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* remove outdated click-datetime, replace click with asyncclick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

@@ -425,6 +425,26 @@ async def test_children_on_since(dev):
         assert plug.on_since
 
 
+@strip
+async def test_get_plug_by_name(dev: SmartStrip):
+    name = dev.plugs[0].alias
+    assert dev.get_plug_by_name(name) == dev.plugs[0]
+
+    with pytest.raises(SmartDeviceException):
+        dev.get_plug_by_name("NONEXISTING NAME")
+
+
+@strip
+async def test_get_plug_by_index(dev: SmartStrip):
+    assert dev.get_plug_by_index(0) == dev.plugs[0]
+
+    with pytest.raises(SmartDeviceException):
+        dev.get_plug_by_index(-1)
+
+    with pytest.raises(SmartDeviceException):
+        dev.get_plug_by_index(len(dev.plugs))
+
+
 @pytest.mark.skip("this test will wear out your relays")
 async def test_all_binary_states(dev):
     # test every binary state