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/linux/linux-installer.sh.in

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+# Halt on first error
+set -e
+
+if [ "$(id -u)" != "0" ]; then
+   echo "This script must be run with root (sudo) privileges" 1>&2
+   exit 1
+fi
+
+# Console colors
+RED="\\x1B[1;31m";GREEN="\\x1B[1;32m";YELLOW="\\x1B[1;33m";PLAIN="\\x1B[0m"
+
+# Statuses
+SUCCESS="   [${GREEN}success${PLAIN}]"
+FAILURE="   [${RED}failure${PLAIN}]"
+WARNING="   [${YELLOW}warning${PLAIN}]"
+
+mask=755
+
+echo -e "Starting install...\n"
+
+# Clear the log for writing
+> "${install.log}"
+
+run_task () {
+    echo -e "Running $1 task..."
+    if [ -n "$DEBUG" ]; then
+        "./${project.filename}" $@ && ret_val=$? || ret_val=$?
+    else
+        "./${project.filename}" $@ &>> "${install.log}" && ret_val=$? || ret_val=$?
+    fi
+
+    if [ $ret_val -eq 0 ]; then
+        echo -e "   $SUCCESS Task $1 was successful"
+    else
+        if [ "$1" == "spawn" ]; then
+            echo -e "   $WARNING Task $1 skipped.  You'll have to start ${project.name} manually."
+            return
+        fi
+        echo -e "   $FAILURE Task $1 failed.\n\nRe-run with DEBUG=true for more information."
+        false # throw error
+    fi
+}
+
+# Ensure java is installed and working before starting
+"./${project.filename}" --version
+
+# Make a temporary jar for preliminary installation steps
+run_task preinstall
+
+run_task install --dest "/opt/${project.filename}"
+
+# We should be installed now, generate the certificate
+pushd "/opt/${project.filename}" &> /dev/null
+run_task certgen
+
+# Tell the desktop to look for new mimetypes in the background
+umask_bak="$(umask)"
+umask 0002 # more permissive umask for mimetype registration
+update-desktop-database &> /dev/null &
+umask "$umask_bak"
+
+echo "Installation complete... Starting ${project.name}..."
+# spawn itself as a regular user, inheriting environment
+run_task spawn "/opt/${project.filename}/${project.filename}"
+
+popd &> /dev/null