Introduce namespaces

[Fiedzia]

Assuming growing number of crates, it would be good to group them, so that we have for example

stdx::types::numeric::num insead of just stdx::num

[LLBlumire]

I'd actually be against this. I think the current system keeps it clear that this is a collection of crates not actually doing any work itself

[brson]

Thanks for the suggestian @Fiedzia. Right now I feel the set of crates is small enough to digest as one list, and want to try keeping a flat namespace. It'll surely get more unwieldy as the list grows though.

[Thanayaby]

Lorises