The One Stop Shop for Previous Submodule Pitches

[Ponyboy47 (Jacob Williams)]

I think this one also applies:

Namespaces × submodules

My 2c on this: Syntactically, we should have a definition of a namespace, like this: namespace Foo {} and given that it should probably have braces, it should allow things to be defined inside of it explicitly. However, I agree we don't want to have entire files nested under namespaces. Something file-based like Java's package system is one very reasonable approach on this: a definition in the file specifies the default namespace for everything within it. Another (complementary) approach w…