api/_common/ColorLight: change rgb to hsv

This makes it much easier to have fine grained control
over colors and cycle through them easily (0--360).

This also makes it consistent with sensor APIs. Now you
can measure the color and plug it into this method.

We can make this change because none of
the implementations use this yet.

If we feel we miss out by dropping the RGB, it would be more fitting
to instead expose R, G, and B attributes which point to instances of
the Light class. However, this is using more memory for something that
isn't very useful.

We could also just provide generic color converters between rgb, hsv,
and perhaps hex html color strings, not tied to any particular light or
sensor.

pybricks/_common.py

@@ -440,13 +440,13 @@ class ColorLight:
         """Turns off the light."""
         pass
 
-    def rgb(self, red, green, blue):
-        """Sets the brightness of the red, green, and blue light.
+    def hsv(self, hue, saturation=100, value=100):
+        """Set the hue, saturation and brightness of the light.
 
         Arguments:
-            red (:ref:`brightness`): Brightness of the red light.
-            green (:ref:`brightness`): Brightness of the green light.
-            blue (:ref:`brightness`): Brightness of the blue light.
+            hue (:ref:`angle`): Hue of the color.
+            saturation (:ref:`percentage`): Saturation of the color.
+            value (:ref:`percentage`): Brightness value of the color.
         """
         pass