Move libgit.a sources into separat "lib/" directory

Hi,

this small patch series follows up on a discussion we had two years ago during the Git Contributor's Summit in Berlin.

I'm fully aware that this will likely result in some discussion, which is why I have labelled this as RFC. I'd be fine with a result of "let's not do it" if we cannot agree on this step, but I think that the current layout hurts discoverability quite a bit. Not only for newcomers, but I'm also struggling with it quite frequently.

Thanks!

Patrick

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This section is used internally by b4 prep for tracking purposes.

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