Instead of just removing the highlight.
Reviewed-by: Robert Loehning

Some fixes were needed after the tool chain type was changed from
QString to an enum.

Task-number: 259939

Reviewed-by: hjk

Let's not irritate MSVC

"Show in Finder", "Add new file...", "Add existing files...".

Also adding category folders for the different file types
(source files, header files, resource files, form files, other files).

the child list.

Use QFileInfo::fileName() to get the filename, since that also works
when the original path wasn't canonical.

also when a context menu action is selected.

This allows the user e.g. to select and run a specific run
configuration with one click.