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c26d8a8b54
Introduce `git_oid_from_string`, `git_oid_from_prefix`, and `git_oid_from_raw`, all of which take a `git_oid_t` that indicates what type of OID should be parsed (SHA1 or SHA256). This allows users to continue to use `git_oid_fromstr` without any code changes, while remaining in a SHA1 world. Note that these are not perfect analogs to the `fromstr` APIs. * `git_oid_from_string` now takes a NUL terminated string, instead of allowing for non-NUL terminated strings. Adding a NUL check feels like an important safety consideration for C strings. * `git_oid_from_prefix` should be used for an OID substring and length. Previous usages of `git_oid_fromstr` with non-NUL terminated strings should move to `git_oid_from_prefix` with the hexsize for the given OID type.