Update to .NET 6.0
.NET 6.0 (#615) * net6.0 * merge upstream and update workflows * use nuget pack not dotnet pack * name * setup nuget separately * change release name back * readme * image before releases * replace webclient with httpclient * use multiline * use line concatenation for a couple places * no slash * use && * break up steps more * fix xml writer errors and such * more fixes * fix httpclient * code cleanup * add back comments Co-authored-by: MICHAEL SHORTREED <[email protected]>