IWYU fixes (#1182)

* iwyu - include fixes

* iwyu - silence some iwyu output

* minor - clearer macro names

* iwyu - fix suggestion of "ceed/ceed.h" externally

* iwyu - lighter petsc heade

IWYU fixes (#1182)

* iwyu - include fixes

* iwyu - silence some iwyu output

* minor - clearer macro names

* iwyu - fix suggestion of "ceed/ceed.h" externally

* iwyu - lighter petsc headers

* iwyu - ceed/ceed.h -> ceed.h

* iwyu - cuda/hip include fixes

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Merge pull request #789 from CEED/will/julia-preferences

Julia interface updates (Preferences.jl)

[Julia] Use new Clang.jl generators