Simpleinjector reimplementation

[jposert]

What kind of change does this PR introduce?
Bugfix

What is the current behavior?
Currently there's no way to use SimpleInjector in projects.

What is the new behavior?
SimpleInjector works well with Splat & ReactiveUI initializations.

What might this PR break?
Probably nothing.

Please check if the PR fulfills these requirements

• [ x] Tests for the changes have been added (for bug fixes / features)
• [ x] Docs have been added / updated (for bug fixes / features)

Other information:
I've tested the solution with my very small project based on WPF - all works okay. Anyway, I've no clue about performance of the solution (probably most important thing on mobile platforms).

[dnfadmin]

All CLA requirements met.

[glennawatson]

There's some failing unit tests unfortunately. You can click the build action to see the details.

Thanks for the work so far

[jposert]

I made a little mistake and i pushed invalid code (sorry). For now, everything should be okay but the build is failing - and I'm not sure why or how to fix it. It's all building on my machine and it passes all the tests successfully.

[glennawatson]

The latest is a build error that is on and off we've seen before with Nerdbank git versioning tool we use. I might make a report to the library author.

[dpvreony]

thanks, few threading tweaks and some bits around the read me just to expand\ clarify knowledge

[dpvreony]

closes #597

[dpvreony]

cleaned up. documented weakness in dupe registrations

[github-actions]

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