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/ant/windows/nsis/Include/IndexOf.nsh

@@ -0,0 +1,28 @@
+!define IndexOf "!insertmacro IndexOf"
+
+!macro IndexOf Var Str Char
+    Push "${Char}"
+    Push "${Str}"
+
+    Exch $R0
+    Exch
+    Exch $R1
+    Push $R2
+    Push $R3
+
+     StrCpy $R3 $R0
+     StrCpy $R0 -1
+     IntOp $R0 $R0 + 1
+      StrCpy $R2 $R3 1 $R0
+      StrCmp $R2 "" +2
+      StrCmp $R2 $R1 +2 -3
+
+     StrCpy $R0 -1
+
+    Pop $R3
+    Pop $R2
+    Pop $R1
+    Exch $R0
+
+    Pop "${Var}"
+!macroend