Async compatible auto and manual reset events.
These reset events aim to serve the same purpose as the .NET AutoResetEvent and ManualResetEvent, but with async methods.
This allows events to be awaited in a manner that doesn't block the thread, allowing easy, efficient, and threadsafe signalling and synchronization.
The library is written for NetStandard 2.0 and .NET 4.5, and is entirely self-contained with no external dependencies.
TODO: accurately describe the implementation's behaviour in detail.
The code is based on Stephen Toub's async primatives implementation
It is also based on Stephen Cleary's AsyncEx library.
AsyncAutoResetEvent and AsyncManualResetEvent both share a common underlying implementation, contained within AsyncResetEvent. The AsyncAutoResetEvent and AsyncManualResetEvent classes themselves are really just thin convenience wrappers, and all they do is set a single boolean value within AsyncResetEvent to tweak its behaviour between manual and auto modes.
The motivation for this was to provide a straightforward, maintainable, and easy to test implementation. This leads to a slightly less efficient manual reset event, but (IMHO) easier to understand and maintain code.