implemented CopyFileEx (W. A variant from W)

[Arthur Ice]

Previous version of CopyFileEx(W,A) failed
to use the clalback function. This version
correctly calls the callback function and
handles on the fly canceling and callback
canceling.

Added support for callback calls. I need to
add better tests but the basics are there.
---
 dlls/kernel32/path.c       |  189 ++++++++++++++++++++++++++++++++++++++++++--
 dlls/kernel32/tests/file.c |   73 +++++++++++++----
 2 files changed, 237 insertions(+), 25 deletions(-)

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