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.

weight_info.gd

@@ -0,0 +1,10 @@
+extends GridContainer
+
+func _on_entry_updated():
+	$Label2.text = str(Global.scale_grams) + "g"
+	$Label4.text = str(Global.tara_grams) + "g"
+	$Label6.text = str(Global.current_entry.weight_grams) + "g"
+	$Label8.text = "%.2f€" % (Global.current_entry.price_cents / 100.0)
+
+func _ready() -> void:
+	Global.weights_updated.connect(_on_entry_updated)