Drop uiop as a primary dependency

[fosskers]

Removing UIOP as a main dependency reduces final binary sizes but also improves compatibility in certain scenarios (WASM).

This PR also moves the .asd files to match convention, but I'm happy to undo that if you prefer them where they were.

[fosskers]

Hi, any thoughts?

[fstamour]

Did you check uiop's licence to see if it was ok to grab code from it?

[fosskers]

Seems to be MIT, which I interpret to mean "do whatever you want" (see https://opensource.org/license/mit).

[fstamour]

I never remember the exact condition (not cl:condition 😅), but doesn't asdf complain (signals a warning) when there are multiple system files in the same directory?

[fosskers]

As in, multiple .asd files? Seems to be okay with it, as far as I can tell.

[Zulu-Inuoe]

No problems from me. The tests are failing but I'm guessing that's due to some incompatible update to SBCL - I'll need to update the version used for tests

[Zulu-Inuoe]

I never remember the exact condition (not cl:condition 😅), but doesn't asdf complain (signals a warning) when there are multiple system files in the same directory?

FYI you're probably thinking of two system definitions in the same file - ASDF would want them named in a specific way, foo and foo/test, it would be mad with foo and foo-test