To make the library widely reusable, enable multi-targeting

[craigfowler]

Currently this library supports only the net45 target. I would like to upgrade it to support the following targets from its NuGet package. This will allow me to support limited runtimes, much like Bodi does.

• net45 or lower, see below
• netstandard1.0
• netstandard2.0

Perhaps support net40

If it's possible and easy, I could support the .NET Framework as low as version 4.0.

Feature support in netstandard

In the netstandard-targeting builds of this library, they will need appropriate NuGet packages in order to polyfill functionally which isn't in netstandard.

Must convert project files to dotnet core

In order to achieve this, I must convert the project format to dotnet core. This supports multi-targeting quite easily from the project files.

[craigfowler]

No support for Compact Framework

So, after some research, it doesn't seem like the .NET Compact Framework is something to consider anymore. Microsoft have deprecated it.