pybricks.common.ColorLight: Add typing.

Also remove pybricks.common.Light which isn't used anywhere.

pupdevices.Light is a standalone light that does not support animations or blinks, so don't inherit from this nonexistent class.

Also remove the ColorLight.reset() method which was never implemented.

doc/common/conf.py

@@ -323,6 +323,7 @@ def on_missing_reference(app, env, node, contnode):
         "mA",
         "ms",
         "mNm",
+        "Hz",
     ]:
 
         # If they match on raw source, we are dealing with argument types.