[Feature] Runtime and SDK Minor Version Roll-forward

[JRAlexander]

Runtime and SDK Minor Version Roll-forward

You will now be able to run .NET Core applications on later runtime versions, within the same major version range. For example, you will be able to run .NET Core 2.0 applications on .NET Core 2.1 or .NET Core 2.1 applications on .NET Core 2.5 (if we ever ship such a version). The roll-forward behavior is for minor versions only.

This will cover both Runtime Minor Version Roll-forward, and SDK Minor Version Roll-forward.

[JRAlexander]

Fixed by #5670