* trial azure pipelines
[skip ci]
* use vs2017
* build pr commits
* include codecov and update test nuget
* add codecov call
* add publish test results step
* include coverlet package for test coverage and allow coverlet dynamic public types
* add azure pipelines badge and remove appveyor badge
* add nuget pack step
* use build configuration variable for nuget pack and move after build
* fix path to package to pack
* change nuget to dotnet pack
* remove old codecov related tools
