Codechange: [CMake] Auto-fill list of #include in script_window.hpp

[glx22]

Motivation / Problem

Enumerations in script_window.hpp are extracted from headers in a regex generated list.
However the #include lines on top of script_window.hpp are all handwritten in script_window.hpp.in.
So while the enum generation auto detects new files, it is still required to manually add the #include.

Description

Use the regex generated list of headers not only for extracting enumerations but also to automatically fill the #include lines.

Limitations

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR touches english.txt or translations? Check the guidelines
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker

[PeterN]

gfx_type.h is no longer included in the generated file, I assume this just wasn't needed.