class and interface modifiers should be internal when publishing source nuget

[Meerownymous]

Expected Behavior

Source Nuget package does not conflict with non-source package.

Actual Behavior

Because the object modifiers of source packages are public, they conflict with the objects in the non source package.
This can be solved by replacing all public modifiers with internal or private prior to building the source package.

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Steps to reproduce the behavior

The log given by the failure.