refactor: Replace all header include guards with pragma once

[Skyaero42]

Automatically strip #ifndef/#define pairs and matching #endif that follow #pragma once in header files. Cleans up legacy patterns left from mixed guarding styles.

In order of commits:

• Remove redundant ifndef/define pairs if pragma once is present
• Special case for codex.h and related files that needed manual attention
• Remove ifndef/define pairs and replace it with pragma once
• Readjust linebreaks to ensure there is exactly one empty line before and one empty line after pragma once.

squash merge or rebase merge is both fine.

[xezon]

Nice.

It looks like some are missing. For example #ifndef CARDINALSPLINE_H.

Before merging this change, we need another change first that removes all _MSC_VER tests around #pragma once (mostly present in WWVegas), because otherwise these headers will not compile on non MSC after the C include guards are removed.

#if defined(_MSC_VER)
#pragma once
#endif

to

#pragma once

[Skyaero42]

Moving to draft to tackle MSC_VER guard of pragma first in a different PR.

[xezon]

This change can continue now.

[Skyaero42]

Working on it :)

[Skyaero42]

Ready for review

[xezon]

This file contains:

#ifndef _BASE_TYPE_H_
#include <Lib/BaseType.h>
#endif

[xezon]

There are still things to clean in this file.

Also in

• curve.h
• uarray.h
• colmath.h
• registry.h
• ...

and many more. I think you need to audit WW headers and remove all #ifndef around includes.

Or do you want to do that in a follow up change?

[xezon]

This change cannot be merged as is with Rebasing, because it contains commits that do not compile on their own.

Will be merged with Squash, unless individual commits are fixed for Rebasing.

[Skyaero42]

Let's squash merge this. I'll pick up the other ifdefs in a seperate PR. That allows this PR to focus on pragma once only