tfg13

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No worries, I'm rewriting it at the moment

Reworked and addressed all comments. It looks much better now, and handling a dynamic list of iovecs even has the nice bonus that `initrds_need_combine` can be replaced with a simple...

Re: Adding multi-initrd support. It should be super easy now, happy to try - but not in this PR, this is already going on for waaay too long.