Atomic implementation of create file and obtain handle for Win/Symbian

Besides generating a unique name, createFileFromTemplate now also
acquires a file handle on all platforms. The file engine's native handle
is passed by reference and modified in place.

This fixes a long standing security issue on Windows.

On Windows and Symbian platforms we directly use the "native" file path
when processing the template and generating the unique name. Since the
native encoding is known, conversions at this point are safe.

Errors other than "file exists" are propagated to Q(Temporary)File,
and result in a failure in open(). The changes also unify error handling
and should give consistent behaviour across all platforms.

Worthy of note, there's a change in behaviour on Windows and Symbian:
fileNames returned by QTemporaryFile on Windows and Symbian are always
absolute after open has been called. This has to do with how
QFileSystemEntry::nativeFilePath works on these platforms. (Test was
updated to reflect change in behaviour.)

Reviewed-by: Gareth Stockwell
Reviewed-by: Shane Kearns

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