Removes unnecessary header dependencies that have accumulated over time
as changes have been made. Lessens the amount of files that need to be
rebuilt when the headers change.
UserConfig instances contain up to 16 std::shared_ptr<Coprocessor>
instances. We can std::move here to avoid performing 16 redundant atomic
reference increment and decrement operations.
Mostly inconsequential on x64, but we may as well signify intent.
Provides a more "correct" move constructor/assignment operator, since
these relevant functions shouldn't throw exceptions.
Has the benefit of playing nicely with std::move_if_noexcept and other
noexcept library facilities.
