* introduce multicore load initial corpus
* update fuzzers/libfuzzer_libpng_norestart to use multicore corpus loading
* run clippy
* use CoreId and Cores in state if std
* misc. typos
* adapt multicore load initial inputs to allow resumable corpus loading
in case of crashes or timeouts during corpus loading.
* add std feature flag to multicore_inputs_processed
* fix doc comment
* run fmt for example fuzzer
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Co-authored-by: aarnav <aarnav@srlabs.de>
Co-authored-by: Romain Malmain <romain.malmain@pm.me>
Co-authored-by: Dongjia "toka" Zhang <tokazerkje@outlook.com>
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