One can now write
with special_cased_file("base/dir", "foo.txt") as fh:
do_something(fh)
This makes the code of processJson a bit clearer, and it allows us to
easily add more files that support the special handling comments.
Change-Id: Ia25d0c0d48df1802c5e2123d05345a88b42a2981
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>