Build and Debug PCSX2

Build PCSX2 from an exact commit, or take an official release. Run it against a throwaway data root with a file log, and decide which layer owns a failure (build, setup, guest, renderer, or host) before changing anything. The cards are pinned to PCSX2 commit 2c804670 (v2.9.84) and the official v2.8.2 macOS release (sources).

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