Eventloop Implementation for Android/iOS/Xaml/Mac/WinRT

See: https://github.com/paulcbetts/splat/issues/77

First run at an implementation. I haven't edited the project files yet, but I can do so once the code is reviewed. The Android/iOS/Xaml implementation have all been tested. The WinRT code appears to compile but I don't have access to the platform to test. The Mac code is nearly identical to iOS but I don't have a license to test it with.


Why do you prefer Dispose() over Stop()? It's unlikely that an event loop will be used in a using block for instance.  One benefit I can see of using Stop is to instead provide:

Task StopAsync()

which the caller can await if they want to do work explicitly after the thread is dead.