Add custom QZ Tray fork with pairing key authentication

- Custom fork of QZ Tray 2.2.x with certificate validation bypassed
- Implemented pairing key (HMAC) authentication as replacement
- Modified files: PrintSocketClient.java (certificate check disabled)
- New files: PairingAuth.java, PairingConfigDialog.java
- Excluded build artifacts (out/, lib/javafx*) from repository
- Library JARs included for dependency management

tray/test/qz/installer/provision/resources/script4.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+
+import os
+
+def notify(title, message):
+  os.system(f"notify-send '{title}' '{message}'")
+
+title=os.getenv('APP_TITLE')
+version=os.getenv('APP_VERSION')
+printer="\U0001F5A8"
+tada="\U0001F389"
+
+notify("{} {}".format(printer, title), """{} This is a sample message from {} {}.
+
+This message indicates that provisioning startup tasks are working.""".format(tada, title, version))