Add shared library support for Windows

Resolve erroneous clang-tidy warning about using a moved from pointer

The clang-tidy warning `clang-analyzer-cplusplus.Move` warns when a
moved from object is deferenced. This is triggered in spdlog because
clang-tidy fails to detect that the `logger:set_formatter` will only
move the unique_ptr on the last iteration of the loop, assuming that
`f->clone` may be called on it afterwards.

To fix, add a break statement after moving the pointer (on the last
iteration) to let clang-tidy know the logger pointer is not used after
this point.