Created message class and updated menu system

scripts/Classes/message.gd

@@ -0,0 +1,14 @@
+## Represents string that differs in fact value and a value which should be displayed to player
+class_name Message
+
+## Fact value
+var fact: String
+## Display value
+var shown: String
+
+## Returns message with set fact and shown strings
+static func create(fact: String, shown: String) -> Message:
+	var msg = Message.new()
+	msg.fact = fact
+	msg.shown = shown
+	return msg