Async I/O

Files and sockets whose operations suspend the calling task until they complete.

Name	Description
`Functions and constants` functions	Free functions and constants of Async I/O.
`AsyncFile` class	A file for overlapped I/O on the core's I/O completion port.
`AsyncFileIoRequest` class	An overlapped file read or write.
`AsyncIoRequest` class	A request that also stores the operation's error code.
`AsyncIoRequestBase` class	One overlapped I/O operation.
`AsyncIpSocket` alias	An IPv4/IPv6 socket for overlapped I/O from tasks.
`AsyncSocket` class	A socket for overlapped I/O from tasks.
`AsyncSocketIoRequest` class	The state of one overlapped socket operation.
`AsyncSocketRecvIoRequest` class	A request for receive operations that also captures the result flags.
`AsyncTcpSocket` class	A TCP socket for overlapped I/O from tasks.
`BulkIoOptions` struct	The shape of the overlapped I/O of `AsyncFile::ReadFile` and `AsyncFile::WriteFile`.
`OrderedFileWriter` class	An output file built front to back in memory, with the copying and writing done by other tasks.
`OrderedFileWriterSettings` struct	How an `OrderedFileWriter` writes: granule, writes at once, copy queue sizes.
`OrderedFileWriterStats` struct	Counters of a finished `OrderedFileWriter`.
`StreamedFileReader` class	A file streamed into memory, addressed like a mapped file, with bounded memory use.
`StreamedFileReaderSettings` struct	How a `StreamedFileReader` reads: granule, how far ahead, how many reads at once.
`WaitableAsyncFileIoRequest` class	A file request whose completion a task can wait for.
`WaitableAsyncSocketIoRequest` class	A socket request a task can wait on until the operation completes.