kernel: split CLI argument parsing into two phases; and more #6013
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Besides running `clang-format` on the code, we replace one IS_PLIST check by a direct tnum comparison, split 2 and 3 argument variant implementation.
fingolfin
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topic: kernel
release notes: not needed
Most arguments are handled in the first stage. In particular all that are relevant for the GC. The second stage is only for the arguments which add GAP roots paths: those involve storing strings, which can be of arbitrary size. We'd like to switch their handling from C strings to GAP strings, but that requires the memory manager to be initialized. With this patch, it *is* initialized before we parse the root paths.
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I've extracted parts of PR #5941 (which got stalled due to unexpected difficulties) into this PR. The idea being that that other PR gets simpler (hence easier to understand/debug/discuss), and thus there is also less chance for conflicts arising.