Add initial PS4 ELF project support with a pinned public compiler - #92

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Branch 'codex/ps4-support' isn't named for what it does. Use <type>/<short-name-in-kebab-case>, the type one of feat, fix, refactor, perf, docs, test, ci, build, chore, revert (e.g. fix/ps2-long-symbol-names). Rename it with: git branch -m <new> && git push -u origin <new>, then open the pull request again from it.