Asn1crypto

- Allow `_perf` submodule to be removed from source tree when embedding

- Fixed DER encoding of `core.Set` and `core.SetOf`
- Fixed a bug in `x509.Name.build()` that could generate invalid DER encoding
- Improved exception messages when parsing nested structures via the `.native`
attribute
- `algos.SignedDigestAlgorithm` now ensures the `parameters` are set to
`Null` when `algorithm` is `sha224_rsa`, `sha256_rsa`, `sha384_rsa` or
`sha512_rsa`, per RFC 4055
- Corrected the definition of `pdf.AdobeTimestamp` to mark the
`requires_auth` field as optional
- Add support for the OID `1.2.840.113549.1.9.16.2.14` to
`cms.CMSAttributeType`
- Improve attribute support for `cms.AttributeCertificateV2`
- Handle `cms.AttributeCertificateV2` when incorrectly tagged as
`cms.AttributeCertificateV1` in `cms.CertificateChoices`

- Improved general parsing performance by 10-15%
- Add support for Windows XP
- Added `core.ObjectIdentifier.dotted` attribute to always return dotted
integer unicode string
- Added `core.ObjectIdentifier.map()` and `core.ObjectIdentifier.unmap()`
class methods to map dotted integer unicode strings to user-friendly unicode
strings and back
- Added various Apple OIDs to `x509.KeyPurposeId`
- Fixed a bug parsing nested indefinite-length-encoded values
- Fixed a bug with `x509.Certificate.issuer_alt_name_value` if it is the first
extension queried
- `keys.PublicKeyInfo.bit_size` and `keys.PrivateKeyInfo.bit_size` values are
now rounded up to the next closest multiple of 8

- Fix a bug in `x509.URI` parsing IRIs containing explicit port numbers on
Python 3.x

- Added `x509.TrustedCertificate` for handling OpenSSL auxiliary certificate
information appended after a certificate
- Added `core.Concat` class for situations such as `x509.TrustedCertificate`
- Allow "broken" X.509 certificates to use `core.IA5String` where an
`x509.DirectoryString` should be used instead
- Added `keys.PrivateKeyInfo.public_key_info` attribute
- Added a bunch of OIDs to `x509.KeyPurposeId`

- Added DH key exchange structures: `algos.KeyExchangeAlgorithm`,
`algos.KeyExchangeAlgorithmId` and `algos.DHParameters`.
- Added DH public key support to `keys.PublicKeyInfo`,
`keys.PublicKeyAlgorithm` and `keys.PublicKeyAlgorithmId`. New structures
include `keys.DomainParameters` and `keys.ValidationParms`.