Bug#1142180: files using std:: objects must declare their headers

[Drew Parsons]

Incidently the std::cout errors reported here are triggered by vtk 9.6.
Previously vtk had been including the headers and declaring use of std::cout etc.
It stoppe doing that in MR#11993
https://gitlab.kitware.com/vtk/vtk/-/merge_requests/11993

So this bug had been present earlier, but was hidden by
previous versions of vtk.

Files which are using std:: objects must #include their respective headers.