Add test for bad 'Icon Groups' but good 'Icons' such as created
by old versions of Watcom C/C++
That icon shows fine in Windows Explorer WinXP/Win2K3,
but does not show in WinVista/Win7 anymore.
A very special corner case.
We will commit the proposed fix shortly after committing the new test.
- Improve the test by examining total number of icon groups in files
and by adding more testcases including two new icon files.
- Add new ROS.ico file which has both a normal icon and a PNG one.
- Add tests for explorer.exe and new ROS.ico and sysicon.ico files.
CORE-18897
