Add python based source for designs

Copy structure of src/designs.lua to designs.py to have the metadata for
the available designs available to Python scripts.

designs.py

@@ -0,0 +1,82 @@
+# Keep this file in sync with src/designs.lua
+
+colors = [
+	"red",
+	"green",
+	"black",
+	"cyan",
+	"purple",
+	"yellow",
+	"white",
+	"orange",
+	"pink",
+	"blue",
+	"lime",
+]
+
+contents = [
+	"empty",
+	"liquid",
+	"frozen",
+]
+
+base_models = [
+	"cone_normal",
+	"cone_slim",
+	"cone_inverted",
+	"cylinder",
+	"tube_one",
+	"tube_two",
+	"tube_three",
+	"sphere_normal",
+	"sphere_tiny",
+	"sphere_double",
+	"sphere_tubed",
+	"sphere_hemi",
+	"sphere_spiked",
+	"hourglass",
+	"torus",
+	"klein",
+	"pyramid",
+	"cube",
+	"triangle",
+	"triangle_alt",
+	"pentagon",
+	"hexagon",
+]
+
+frozen_models = [
+	"cone_normal",
+]
+
+models = {}
+for model in base_models:
+	variants = {
+		"empty": {
+			"name": "empty",
+			"model": model,
+			"contents": "empty",
+		},
+	}
+
+	for color in colors:
+		variants[f"liquid_{color}"] = {
+			"name": f"liquid_{color}",
+			"model": model,
+			"color": color,
+			"contents": "liquid",
+		}
+
+	if model in frozen_models:
+		for color in colors:
+			variants[f"frozen_{color}"] = {
+				"model": model,
+				"name": f"frozen_{color}",
+				"color": color,
+				"contents": "frozen",
+			}
+
+	models[model] = {
+		"name": model,
+		"variants": variants,
+	}