macOS: Replaced deprecated Cocoa API calls.

Most of these calls were replaced with the successors as suggested
by Xcode's Fix-It. Functionality should not be affected.
This reduces the number of warnings when building on macOS.

macOS: Replaced OSSpinLock with os_unfair_lock.

OSSplinLock is a deprecated API, os_unfair_lock is its successor.
This reduces the number of warnings when building on macOS.

Cleanup: clang-format

macOS: Enabled posix_memalign() like on other Unix platforms.

Fixed macOS build, header cleanup was too agressive.

Compositor: Reversed order of Normal and Albedo in Denoising Node.

Fix T68944: Added check for SSE4.1 to denoising node.

Since OpenImageDenoise requires a CPU with SSE 4.1 or newer,
let the node act as passthrough on unsupported CPUs and display
a message in the node itself.

Compositor: Run only one instance of OIDN at a time.

Running multiple instances of OIDN simultaneously can use dozens
of GBs of memory. Since OIDN is multithreaded internally, we can run
only one instance at a time and should not lose much performance.
Fixing T69006

OpenVDB: Fixed in-memory rendering.

build_env: Added OpenImageDenoise to install_deps.sh

Building OIDN still needs to be enabled explicitly with --with-oidn.
It will fail with older versions of CMake or TBB, so I can't make
any guarantees for various Linux distributions or versions.