[websocket] Implement HttpListenerContext.AcceptWebSocketAsync().
[websocket] Cleaner closing.
[websocket] Better hijacking.
[websocket] Use string.Equals instead of String.Compare
[websocket] Don't use string +=
Reimplement StreamWebSocket.
Fix some bugs.
Support CloseStatus
Support receiving frame larger than buffer.
Use do ... while (true)
Fix handling fragment and opcode.
Fix indent of author.
Remove checking Origin header.

RFC requires Origin header for browser client.
Non browser client may be omit Origin header.
[MWF] Fix opacity of form (#19856)
Merge pull request #1040 from ermshiperete/bug-xamarin-19856

[MWF] Fix opacity of form (#19856)
[mcs] Use correct parent type in partial type base context
[llvm] Detect the cpu architecture and pass it to EngineBuilder, recent llvm versions require this to be able to support sse etc.
[corlib] Add Guid hex format parsing with whitespaces. Fixes #19915
[System.Core][ios] Fix value for ENAMETOOLONG (typo?) internal constant in System.IO.MemoryMappedFiles.MemoryMappedFile
[llvm] Update to the llvm backend to work with llvm a82b09c3a3efbfaf2ce39adc113f9a5458cde398.