Led light control, close #991 (#1106)

* feature: add leds panel

* Various refactors and improvements

* lint fixes

* led: use more columns for the selector

* leds: name in the title

* mainsail presets

* change sliders to horizontal to avoid visual bug, simplify defaults

* led: add a color preview and simplify methods to fix some issues

* simplify presets move all the logic to the panel

* led: change presets from names to previews

* preview label shows color, add vertical mode

* led: colored previews as rectangles instead of circles

---------

Co-authored-by: alfrix <alfredomonclus@gmail.com>

ks_includes/KlippyGcodes.py

@@ -39,3 +39,11 @@ class KlippyGcodes:
     @staticmethod
     def bed_mesh_save(profile):
         return f"BED_MESH_PROFILE SAVE='{profile}'"
+
+    @staticmethod
+    def set_led_color(led, color):
+        return (
+            f'SET_LED LED="{led}" '
+            f'RED={color[0]} GREEN={color[1]} BLUE={color[2]} WHITE={color[3]} '
+            f'SYNC=0 TRANSMIT=1'
+        )