Typo correction
Switch tests to XCTest
Replace some blocks with `id`

It is frustrating when clang complains about having to convert int to bool or bool to BOOL, or uint to NSUInteger.

Yes there can be conversion issues with uint and NSUInteger but we use NSUInteger internally and if you are butting up against the limits of integers you should be aware of that and taking precautions anyway.

Make YOLOKit more pleasant to use.

We don't get Xcode completion for the blocks anyway, so this is just win.
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