Initial commit

Half-baked state. Most of the UI is mostly done, but the integration
with Grist (or any other data provider) is still missing.

providers/debug_scale.gd

@@ -0,0 +1,8 @@
+extends Node
+
+# This function should eventually set up the connection to the scale
+# and make the updates flow accordingly
+# For now, the DebugScaleSlider does that
+
+func start():
+	pass