Refactor Lua string escaping to a new utility class

app/SharedTools/LuaTools.cs

@@ -0,0 +1,10 @@
+namespace SharedTools;
+
+public static class LuaTools
+{
+    public static string EscapeLuaString(string value)
+    {
+        // Replace backslashes with double backslashes and escape double quotes:
+        return value.Replace("\\", @"\\").Replace("\"", "\\\"");
+    }
+}