* Update GPIO library and samples to NRTs

* Simplify if checks

* Simplify if checks

* Update per feedback

* Fix code style with pragma

* Update NRT annotations

* Update Windows-specific NRT errors

* Remove null check

* Remove type constraint

* Remove null check

* Simplify NRT annotations

* Enable nullable for _pinModes

* Adding a comment to the pragma
Co-authored-by: NJose Perez Rodriguez <joperezr@microsoft.com>

* Added Board class and CM3 Driver

* Changed summuary pincount

* Updated summary label

* Added support for Raspberry Pi4, some refactoring

* Deleted cref in GetBoardModel summary

* Refactoring wrong namespace

* Refactoring

* ValidatePinNumber test is wrong

* Make the detection internal for now - will be reviewed later

Move actual identification code to new place.

* Better matching class name

* Cleaner exception handling

* Avoid exception to control code flow

Is a bit of a mess due to the existing public API

* Rename class again, use properties only

* Add copyright header

* Better error message, correct execution order
Co-authored-by: NJTrotta <gerardo.trotta@euronet.aero>

Co-Authored-By: NJose Perez Rodriguez <joperezr@microsoft.com>

* Added solution with all the projects

Useful for global changes, i.e StyleCop or dependencies

* Add stylecop rules to project

Need workaround for an issue with GeneratePlatformNotSupportedAssembly

Put a comment on all rules that are enabled in dotnet core but not here.
Some rules are enabled here but not there.

* Fix all enabled rules in Core

* Use autogenerated instead of message suppression for Interop stuff

* Iot.Device.Bindings (the overall project) imports the base Directory.Props directly, so exclude for now

* Use #pragma warning disable instead of <autogenerated />

* Added editconfig file

* Beginning of cleaning

* Added summaries and sorted

* Added callback summaries

* Fixed ordering and switch/case based on feedback

Adding Raspberry Pi Driver