2.0.0

• PHP 8.1 is now required
• Renamed Status and Message to HttpStatus and HttpMessage respectively
• Added a message parameter to Http2Processor::handleShutdown()
• Http2Parser constructor now requires an HPack instance to be injected, as well as providing parameters for upgrade settings, header size limit, and frame size limits
• Http2Parser::parse() was removed; Http2Parser now has a push() and cancel() methods to push received data and end parsing
• Added HttpRequest and HttpResponse as abstract base classes for requests and responses
• HttpRequest now includes methods for getting and setting query parameters
• Moved Rfc7230 to Http1 sub-namespace.
• Renamed header methods using the term "raw" to use "pairs" instead, e.g., getRawHeaders() → getHeaderPairs(), parseRawHeaders() → parseHeaderPairs()
• Added mapHeaderPairs() function to convert header pairs returned from functions such as Rfc7230::parseHeaderPairs() into a map similar to that returned by Rfc7230::parseHeaders()
• Passing an int, float, or Stringable as an array value to HttpMessage::setHeaders() will cast the value to a string instead of throwing a TypeError
• Removed parseFieldValueComponents() and createFieldValueComponentMap(), replacing them with four new functions:
  • splitHeaders() — Splits comma-separated fields into individual components. Returns null if a syntax error is encountered.
  • parseMultipleHeaderFields() — Parses a list of key-value pairs from each comma-separated and semi-colon delineated header value. Returns null if a syntax error is encountered.
  • parseSingleHeaderFields() — Parses a single semi-colon delineated header into key-value pairs.
  • parseHeaderTokens() — Parses a list of tokens from comma-separated header values.