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/assets/signing/sign-message.jsl

@@ -0,0 +1,48 @@
+//
+// J# Signing Example
+// Echoes the signed message and exits
+//
+
+// #########################################################
+// #             WARNING   WARNING   WARNING               #
+// #########################################################
+// #                                                       #
+// # This file is intended for demonstration purposes      #
+// # only.                                                 #
+// #                                                       #
+// # It is the SOLE responsibility of YOU, the programmer  #
+// # to prevent against unauthorized access to any signing #
+// # functions.                                            #
+// #                                                       #
+// # Organizations that do not protect against un-         #
+// # authorized signing will be black-listed to prevent    #
+// # software piracy.                                      #
+// #                                                       #
+// # -QZ Industries, LLC                                   #
+// #                                                       #
+// #########################################################
+
+module sample
+
+open System
+open System.Security.Cryptography
+open System.Security.Cryptography.X509Certificates
+open System.IO
+open System.Text
+
+let request = "test data"
+
+// How to associate a private key with the X509Certificate2 class in .net
+// openssl pkcs12 -export -in private-key.pem -inkey digital-certificate.txt -out private-key.pfx
+let cert = new X509Certificate2("private-key.pfx")
+
+let sha1 = new SHA512CryptoServiceProvider() // Use "SHA1CryptoServiceProvider" for QZ Tray 2.0 and older
+
+let csp = cert.PrivateKey :?> RSACryptoServiceProvider
+let encoder = new ASCIIEncoding()
+
+let data = encoder.GetBytes(request)
+let binaryData = csp.SignData(data, sha1)
+let output = Convert.ToBase64String(binaryData)
+
+Console.WriteLine output