.Net6 (#112)

* Added .NET 6 support

* fix constants

* Upgrade Android sample app to .net6.0

* Fix build warnings and update android sample

* Change baseline version

* Fix build

* Delete unused code

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update CIBuild.yml

* Update expired certificate

* Set min versions

* Fix api build

* Fix build warnings and update doc builds

* update metadata

* tweak readme

* Use net8 for ios/android

* Fix target frameworks for sample apps

* Fix UWP build

* update tfm

* Update to v3.0 and remove out of support frameworks

* Add BT device to net6-windows

* Add MAUI sample and delete Android

* Clean up

* Update github action dependency to supported version

* Update certificate

* Update certificate

* Fix RMC FixTime parsing that can lose sub-second precision with doubles (#117)

* Extract local variables for the parameters of DateTimeOffset

* Add seconds to FixTime as Ticks in order to preserve sub-second precision that can get lost by using doubles

---------

Co-authored-by: Justin King <justin.king@vibrationresearch.com>

* Cleanup of fix and add unit test to verify

---------

Co-authored-by: Morten Nielsen <mort5161@esri.com>
Co-authored-by: Justin King <56605940+justinswork@users.noreply.github.com>
Co-authored-by: Justin King <justin.king@vibrationresearch.com>

docs/index.md

@@ -2,7 +2,7 @@
 
 Library for reading and parsing NMEA data message streams. It makes it easy to connect and listen for NMEA messages
 coming from various devices in Windows Universal, Windows Desktop/.NET and Windows Universal apps as well
-as Xamarin for iOS and Android.
+as .NET iOS and .NET Android.
 
 
 ## Sponsoring