OsVersions

Container class for iOS versions. Necessary, iOS versions used to always be encoded into attestation statements using SemVer syntax. Newer iPhones, however, use a hex string representation of the build number instead. Since it makes rarely sense to only check for SemVer not for a hex-encoded build number (i.e only accept older iPhones), encapsulating both variants into a dedicated type ensures that either both or neither are set.