Import 3 x imaging instruments from various sources

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Free-form text area

Please describe what your PR is adding in terms of features or bugfixes:

Import of:

• Radiography_Li_battery (Mads Bertelsen & Viktor Holm)
• Radiography_Sword (Mads Bertelsen & Viktor Holm)
• PSI_ICON (Peter Willendrup & Estrid B. Naver)
• Required datafiles and a couple of new components

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Declaration of use of AI-tools

• Please add a checkmark here if you used AI-tools during the work for this contribution
• Furter, please describe how / where and for what the tools were used:
  No AI this time round. Just me… ;-)

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Development OS / boundary conditions

Please describe what OS you developed and tested your additions on, and if any special dependencies are required:

macOS Tahoe, conda-forge dev-tools

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PR Checklist for contributing to McStas/McXtrace

For a coherent and useful contribution to McStas/McXtrace, please fill in relevant parts of the checklist:

• My contribution includes a new component file

  • I have ensured that naming of parameters are in the style of existing components. (Please check the McStas or McXtrace NOMENCLATURE docs.)
  • I have ensured that component parameters are in the usually units of McStas or McXtrace (SI + neutron/x-ray 'usual' units)
  • I have used the mcdoc utility and rendered a reasonable documentation page for the component (please attach as screenshot in comments!)
  • I have ensured that basic use of the component is OK (e.g. an instrument using it compiles?)
  • I have included a corresponding example instrument and will fill in the new instrument section below
  • I have used the mccode-clangformat tool to apply the standard McCode component indentation scheme
  • My new component is added within the contrib component category

• My contribution includes a new instrument file

  • I have used the mcdoc utility and rendered a reasonable documentation page for the instrument (please attach as screenshot in comments!)
  • I have ensured that basic use of the instrument is OK (e.g. it compiles?)
  • ... and provided reasonable default parameters in that instrument that produce reasonable output
  • ... and maybe even added a %Example: line to describe expected behaviour
  • I have used the mcrun --c-lint "linter" and followed advice to remove most / all warnings that are raised
  • My new instrument is added within the examples hierarchy in a folder in the style of examples/ESS/New_stuff/New_stuff.instr
  • My new instrument has a new, unique filename, not clashing with existing example instruments
  • My new instrument requires a data/input file. If the datafile is specific for my instrument I have left it in the same example folder, but if general use I have placed it in the global data folder.

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Instrument Radiography_Lithium_Battery:

Instrument Radiography_Sword:

Instrument PSI_ICON:

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Component PSD_monitor_Filter:

Component Wavelength_Diffuser:

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@jorobledo, @farhi here comes the 3 x imaging instruments discussed elsewhere