* upload corpus to https://www.pauldreik.se/ from the x64 github action job (keep the github action cache)
* drop the github action cache (which was not working anyway) for power fuzzer and download the fuzz corpus from https://www.pauldreik.se/ instead
* resurrect arm64 fuzzing on drone CI, downloading the fuzz corpus from https://www.pauldreik.se/
* update the fuzzing documentation
* add definitions for is_number and tie (by lemire)
* add fuzzer for element
* update fuzz documentation
* fix UB in creating an empty padded string
* don't bother null terminating padded_string, it is done by the std::memset already
* refactor fuzz data splitting into a separate class
* initial oss-fuzz friendly build
parts taken from libfmt, which I wrote and have the copyright to
* fix build error
* add script for building a corpus zip
see https://google.github.io/oss-fuzz/getting-started/new-project-guide/#seed-corpus
* fix zip command
* drop setting the C++ standard
* disable the minify fuzzer, does not pass oss-fuzz check-build test
* fix integer overflow in subnormal_power10
detected by oss-fuzz
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18714
* invoke the build like oss fuzz does
* document what the scripts are for and how to use them
* add a page about fuzzing
Paul Dreik