Update check: version feed from the git server's releases, title-screen banner, clearer version refusals

scripts/ui/pause_menu.gd

@@ -100,6 +100,14 @@ func bind(p: CharacterBody3D) -> void:
 		tips_row.add_child(again)
 		_main.add_child(tips_row)
 
+	var upd := CheckButton.new()
+	upd.text = "Check for updates at start (Emberwild %s)" % Updates.version
+	upd.focus_mode = Control.FOCUS_NONE
+	upd.button_pressed = Updates.enabled
+	upd.add_theme_font_size_override("font_size", 16)
+	upd.toggled.connect(Updates.set_enabled)
+	_main.add_child(upd)
+
 	# The tutorial: skip a step, or leave it (saved, to carry on later).
 	if Guide.active:
 		_main.add_child(_button("Skip this tutorial step", func(): Guide.skip(); close()))