Add creation of macOS dSYM debug symbols to symbolicate release builds

[PatTheMav]

Description

Updates all macOS-related build scripts to generate dSYM files in Release configuration.

Also contains a code-cleanup of the zsh-based scripts:

• Unnecessary quoting removed (zsh does not automatically split strings into fields, making space-separated paths safer to use)
• Due to the need of dSYM creation binary stripping is now explicitly done by each fixup step
• Shared library artefacts are automatically removed if a library is rebuilt as a static library (avoids leakage of prior shared library builds)
• C++ and C standard raised to C++17 and C17 respectively, except where the project is not compatible with the standard
• Cleaned up some code doing the same thing but having been implemented in separate ways (e.g. the way static library builds were enforced)
• Refreshed the clean-up steps in the main build scripts to remove more static libraries when a "complete" package is built (necessary because the static libraries are not stripped and thus increased in size)

Motivation and Context

As obs-deps and obs-studio use Release configuration to ship the application, it is necessary to also ship the associated dSYM debug symbols used to build the application.

Debug symbols are identified by UUIDs that are linked to UUIDs of the built binaries, so only a matching pair is able to symbolicate crashes.

How Has This Been Tested?

Debug symbols created for macOS-deps, FFmpeg, and Qt6, universal debug symbols created locally as well.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[RytoEX]

Updates all macOS-related build scripts to generate dSYM files in Release configuration.

Also contains a code-cleanup of the zsh-based scripts:

I kind of wish these were separate PRs so that it was easier to review the "code-cleanup" portions from the more significant changes, but I don't know how difficult it would be to separate them at this point.

[PatTheMav]

Updates all macOS-related build scripts to generate dSYM files in Release configuration.
Also contains a code-cleanup of the zsh-based scripts:

I kind of wish these were separate PRs so that it was easier to review the "code-cleanup" portions from the more significant changes, but I don't know how difficult it would be to separate them at this point.

Most (but not all) are interconnected, as I had to touch all files anyway to add the dSYM creation step, which required adjusting the install steps for all CMake-based dependencies, etc.

[PatTheMav]

Updated this and the other PRs to follow a single dependency trail:

1. deps.qt: Remove Qt5 and update Qt6 build scripts #188
2. deps.windows: Update dependencies for CMake 3.0 upgrade #174
3. Add creation of macOS dSYM debug symbols to symbolicate release builds #183
4. deps.ffmpeg: Switch Windows builds to native build toolchain #186

Following this order will update each part of obs-deps one by one, such as that almost all parts of it are updated in some way at the end of the process.