Delete underscores from submodule filenames

[Soveu]

They are just annoying to type everytime

[Soveu]

Or maybe we should re-organize code a little bit
Now src/lib.rs mostly contains code related to x86/x64 arch, I suggest to move it into src/x86_x64/mod.rs.
It will make lib.rs cleaner and ready for other architectures

[Lokathor]

the underscores have to be there or it conflicts with the naming of the type, since module paths and type paths "live in the same namespace" in the eyes of rust.

[Lokathor]

As to a total re-organization, I'm not against the general idea, and I agree that once ARM intrinsics are ready to be added we might have to re-think things, but I've really never liked either mod.rs or foo.rs being next to the foo/ folder. I'm pretty big on this new inline module based style that I was shown a few months ago, since it lets you avoid both.