Qh3

===================

**Added**
- Support for "IP Address" as subject alt name in certificate verifications

===================

**Removed**
- Dependency on OpenSSL development headers

**Changed**
- Crypto module relies on ``cryptography`` OpenSSL binding instead of our own copy

**Added**
- Explicit support for PyPy

===================

**Removed**

- Dependency on pyOpenSSL
- Dependency on certifi
- Dependency on pylsqpack

**Changed**

- Vendored pyOpenSSL.crypto for the certificate verification chain (X590Store)
- Vendored pylsqpack, use v1.0.3 from upstream and make module abi3 compatible
- The module _crypto and _buffer are abi3 compatible
- The whole package is abi3 ready
- certifi ca bundle is loaded only if present in the current environment (behavior will be removed in v1.0.0)

**Fixed**

- Mitigate ssl.match_hostname deprecation by porting urllib3 match_hostname
- Mimic ssl load_default_cert into the certification chain verification