Merge pull request #42 from wintoncode/update-test-dependencies

Update test dependencies

Merge pull request #40 from wintoncode/allow-opt-out-transaction-scop…

…e-wrapping

feat(Winton.Extensions.Threading.Actor): allow opt-out of transaction scope wrapping in enqueue work

Merge pull request #39 from wintoncode/fix-version-and-push

Fixed versioning and NuGet push

Merge pull request #31 from roederja2/also_wrap_start_work

* Also wrap start/stop work in suppress scope

Merge pull request #30 from roederja2/update_nuget_key

Update nuget key

Re-use thread pool threads (#27)

This is as opposed to queuing each actor task on the thread pool. This
improves performance in many cases.

Improve actor performance via simplication (#26)

Changes related to performance:

- Removed state machine in ActorImpl and merged ActorImpl into Actor;
- Refined ActorTaskScheduler and the way the kind of task being executed is communicated so that using async state is no longer necessary;
- Replaced use of Queue<> in ActorTaskScheduler with something that easily allows putting something at the front, which simplified some logic;
- Made use of pause/resume functionality in ActorTaskScheduler to simplify starting an Actor;
- Made locking in ActorTaskScheduler more fine-grained;
- Used UnsafeQueueUserWorkItem on platforms that support it.

Also:

- Added NET Standard 2.0 support;
- Fixed various long-standing bugs that appeared in edge cases.

Overall, the changes made have reduced locking and complexity, which, apart from anything, has made it easier to track down long-standing spurious test failures and bugs. Performance isn't monumentally better but confidence that things are working correctly has been increased somewhat.

Fix Stop() which lacked a ConfigureAwait(). (#17)

Added a "stopped task" to IActor (#15)

* Project updates
* Added StoppedTask to IActor

Merge pull request #13 from jhickson/fixpauseandresume

Fixed naive approach to pause/resume