In .NET 6, the included C# project templates will use the latest language idioms.

See the parent Epic for details.

Console template:

• remove app template - removed app template, moved changes to console app instead #3424
• top-level program - removed app template, moved changes to console app instead #3424
• global usings - removed app template, moved changes to console app instead #3424
• nullable - removed app template, moved changes to console app instead #3424

Classlib template:

• global usings - removed app template, moved changes to console app instead #3424
• nullable enable nullable on new project templates #3173 do not enable nullable on netstandard2.0 #3299 remove the --nullable option from the app and classlib template #3396
• file-scoped namespaces- dotnet/templating#3360 using file-scoped namespaces in classlib template #3395

Issues:

• Console and classlib cannot be built when langVersion is set to value less than 10 (net6.0) #3449

@KathleenDollard