Vulkan-Loader Add drivers field to settings file

Allows the settings file to contain 'additional drivers' which are just paths to ICD manifest files.

Adds the use_additional_drivers_exclusively boolean field and additional_drivers list to settings array on a per-application basis (AKA in the same object as the layers list.

TODO: Finish writing tests. Make sure environment variables work properly or at least don't make things more complicated. Document changes to manifest file. Double check that additional drivers are 'last' in the list in all situations (linux ordering, windows ordering).

May 02 '25 18:05 charles-lunarg

CI Vulkan-Loader build queued with queue ID 435747.

May 02 '25 18:05 ci-tester-lunarg

CI Vulkan-Loader build queued with queue ID 435764.

May 02 '25 18:05 ci-tester-lunarg

CI Vulkan-Loader build # 3017 running.

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CI Vulkan-Loader build # 3017 aborted.

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May 15 '25 01:05 ci-tester-lunarg

CI Vulkan-Loader build queued with queue ID 444266.

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CI Vulkan-Loader build # 3039 running.

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CI Vulkan-Loader build # 3039 failed.

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May 21 '25 14:05 ci-tester-lunarg

CI Vulkan-Loader build queued with queue ID 448011.

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CI Vulkan-Loader build # 3045 running.

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CI Vulkan-Loader build # 3045 failed.

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Jun 04 '25 12:06 ci-tester-lunarg

CI Vulkan-Loader build queued with queue ID 457695.

Jun 04 '25 12:06 ci-tester-lunarg

CI Vulkan-Loader build # 3054 running.

Jun 04 '25 12:06 ci-tester-lunarg

CI Vulkan-Loader build # 3054 passed.

Jun 04 '25 12:06 ci-tester-lunarg

CI Vulkan-Loader build queued with queue ID 458290.