Add OpenText/brother installers and update printer installer scripts

- New PrinterInstaller support for Brother MFC-J series (driver source,
  DSI files; binaries gitignored)
- New OpenText HostExplorer 15 installer (profiles, shortcuts, .iss;
  .exe/.cab/.msi gitignored)
- New HP printer driver support files (.gpd/.cfg/.xml/.dtd) for 3556
  model series
- PrinterInstaller.iss rework with additional driver paths
- FQDNUpdate, MachineAuth, XeroxOfflineInstaller minor updates

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

HPOfflineInstaller/drivers/hp_x64/hpcu355u.ini

@@ -0,0 +1,31 @@
+#
+# OEM plugin configuration files for Unidrv
+# 
+# 
+# Unified UI/Render plug-ins
+# 
+
+[OEMFiles]
+OEMDriverFile1=hpc6r355.dll
+OEMConfigFile1=hpcui355.dll
+
+[ComponentFiles]
+Component_R_A=hpcur355.dll
+Component_R_B=hpcst355.dll
+Component_R_C=hpcss355.dll
+Component_R_D=hpchl355.cab
+Component_F_A=hpcui355.dll
+Component_F_B=hpcpp355.dll
+Component_F_C=hpc6r355.dll
+Component_F_D=hpcpr355.dll
+Component_F_E=hpcev355.dll
+Component_F_F=hpcls355.dll
+Component_F_G=hpcpn355.dll
+Component_F_H=hpbuio32.dll
+Component_F_J=hpbuio64.dll
+Component_F_K=hpbuioARM64.dll
+Component_F_I=hpmsn355.dll
+
+[BidiFiles]
+;BidiSPMFile=hpcu355bidi_tcp.xml
+;BidiWSDFile=hpcu355bidi_wsd.xml