[ros-svn] [mf] 20396: - refactor icon cache

[mf at svn.reactos.com]

- refactor icon cache
- display icon overlays in Explorer tree view


Updated files:
trunk/reactos/subsys/system/explorer/dialogs/searchprogram.cpp
trunk/reactos/subsys/system/explorer/doc/changes.txt
trunk/reactos/subsys/system/explorer/explorer.cpp
trunk/reactos/subsys/system/explorer/globals.h
trunk/reactos/subsys/system/explorer/shell/entries.cpp
trunk/reactos/subsys/system/explorer/shell/entries.h
trunk/reactos/subsys/system/explorer/shell/mainframe.cpp
trunk/reactos/subsys/system/explorer/shell/shellbrowser.cpp
trunk/reactos/subsys/system/explorer/shell/shellbrowser.h
trunk/reactos/subsys/system/explorer/shell/shellfs.cpp
trunk/reactos/subsys/system/explorer/shell/shellfs.h
trunk/reactos/subsys/system/explorer/taskbar/desktopbar.cpp
trunk/reactos/subsys/system/explorer/taskbar/quicklaunch.cpp
trunk/reactos/subsys/system/explorer/taskbar/startmenu.cpp
trunk/reactos/subsys/system/explorer/taskbar/startmenu.h
trunk/reactos/subsys/system/explorer/utility/utility.h