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.

tara_popup.gd

@@ -0,0 +1,19 @@
+extends PopupPanel
+
+func _ready():
+	%OnscreenKeyboard.show()
+	%LineEdit.grab_focus()
+	
+	%LineEdit.text_submitted.connect(Global.set_tara)
+	%LineEdit.text_submitted.connect(hide.unbind(1))
+	
+	%Button.pressed.connect(_on_button_pressed)
+	Global.weights_updated.connect(_on_weight_update)
+	_on_weight_update()
+
+func _on_button_pressed():
+	Global.set_tara(Global.scale_grams)
+	hide()
+
+func _on_weight_update():
+	%Button.text = "%sg (Waage)" % Global.scale_grams