General cleanups all around (janitoring) (#63)

* Move tests to device-type specific test files to make improvements more approachable

* protocol: remove the port parameter from query, as there are no other known ports, fix docstrings

* Revise docstrings, remove superfluous information and remove unused methods ({set,get_icon} and set_time)

* cli: indent device output to make it more easily readable when having multiple devices

* remove adjust flake8 ignores (we have no setup.py anymore)

* pyproject: include cli tool to coverage, add config for interrogate (docstring coverage)

* bulb: raise exception on color_temp error cases instead of returning zero values

* improve bulb tests, simplify conftest

* strip: rename plugs property to children and move it to smartdevice

kasa/tests/test_plug.py

@@ -0,0 +1,28 @@
+from kasa import DeviceType
+
+from .conftest import plug
+from .newfakes import PLUG_SCHEMA
+
+
+@plug
+async def test_plug_sysinfo(dev):
+    assert dev.sys_info is not None
+    PLUG_SCHEMA(dev.sys_info)
+
+    assert dev.model is not None
+
+    assert dev.device_type == DeviceType.Plug or dev.device_type == DeviceType.Strip
+    assert dev.is_plug or dev.is_strip
+
+
+@plug
+async def test_led(dev):
+    original = dev.led
+
+    await dev.set_led(False)
+    assert not dev.led
+
+    await dev.set_led(True)
+    assert dev.led
+
+    await dev.set_led(original)