feat: add Kenney road and nature assets and implement map builder script

debug/measure_kit.gd

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+extends SceneTree
+
+## Dev tool: print AABBs of prop models used by the city builder.
+
+const PATHS := [
+	"res://assets/props/roads/road-straight.glb",
+	"res://assets/props/roads/road-crossroad-line.glb",
+	"res://assets/props/roads/road-crossing.glb",
+	"res://assets/props/roads/light-curved.glb",
+	"res://assets/props/roads/light-curved-double.glb",
+	"res://assets/props/roads/construction-barrier.glb",
+	"res://assets/props/roads/construction-cone.glb",
+	"res://assets/props/nature/tree_default.glb",
+	"res://assets/props/nature/tree_detailed.glb",
+	"res://assets/props/nature/tree_oak.glb",
+	"res://assets/props/nature/tree_tall.glb",
+]
+
+
+func _initialize() -> void:
+	for p in PATHS:
+		var scene = load(p)
+		if scene == null:
+			print("measure: FAILED ", p)
+			continue
+		var inst: Node3D = scene.instantiate()
+		get_root().add_child(inst)
+		var aabb := AABB()
+		var first := true
+		for mi in inst.find_children("*", "MeshInstance3D", true, false):
+			var b: AABB = mi.global_transform * mi.get_aabb()
+			aabb = b if first else aabb.merge(b)
+			first = false
+		print("measure: %s size=%s min=%s" % [p.get_file(), aabb.size, aabb.position])
+		inst.queue_free()
+	quit()

debug/measure_kit.gd.uid

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+uid://dd4g4l7mg66ro