* Add .NET Core 2.1 as target for tests to allow testing for StackTraceHiddenAttribute handling
* Customize EnhancedStackTrace "hidden" frames selection strategy depending on the runtime, and optimize attribute access for non-reflection-only assemblies
* Add .NET Core 2.1 as target for benchmarks to allow benchmarking for it
* Add an option to get tuple data via reflection.
* Removed non-relfection-based way of getting information about the tuples.
* Make methods static back.
* Remove the nuget dependency to System.ValueTuple
