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Allow schemes to return external file descriptors

Jacob Lorentzon requested to merge 4lDO2/kernel:file_forwarding_v2 into master

Schemes can currently only return file numbers which the kernel will associate with their scheme ID and namespace, in each FileDescription. This MR allows schemes to send, unlike fevent messages, packet.id-associated "scheme-kernel messages", which in this case allows open and dup to return file descriptors owned by other schemes.

Blocked on syscall!73 (merged)

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