Fix zerocoder, use buffers instead of strings for vardata, add util for null-terminated string<->buffer conversion

lib/classes/Utils.ts

@@ -0,0 +1,7 @@
+export class Utils
+{
+    static StringToBuffer(str: string): Buffer
+    {
+        return Buffer.from(str + '\0', 'utf8');
+    }
+}