Update xchat-systray-integration to 2.4.5.

Changes:
+ Fixed some memory leaks due to string duplication
+ Fixed some inclusions
+ New images handler: images are no more included in binary but loaded
  dynamicly, user theme is now permitted
+ Images are now separated in different directory, sorted by usage
+ Added initial Theme feature (will be ready next version)
+ Code splitted in files for a better logical organization
+ Win32 port completly integrated. Same package for all systems.
+ Moved Makefile & similar stuff to main directory
+ Added "make Win32" option to build Win32 shared dll.
+ Added native Win32 Tray with all the old features like double click,
  flash events and so on.
+ Reduced plugin size at 80k bytes only for unix & win32 version too.
+ Win32 settings tab has not the KDE/Gnome switch.
+ Added images path in settings. Plugin must be reloaded manually,
  autoreload in next version.
+ Added images path saving/reloading in data management.
+ Usual code cleaning and minor bug fix.

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