PR# 11349 Please add references to core .NET assemblies by default

When a new .NET project is created in EiffelStudio, by default it does not have references to core assemblies such as System.

That's quite confusing, for those of us used to previous versions of EiffelStudio.

It would also be confusing for people coming from C# or VB or Delphi, who would be used to core assemblies like System being referenced by default by their projects.

Please ensure that a new ,NET Eiffel project has the same assembly references that a new C# project would have in Visual Studio. New WinForms projects should of course have references to the relevant additional assemblies.