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* Remove all uses of `using namespace std` from header files (although a
few specific cases of things like `using std::vector` remain)
* Move all existing uses of `using namespace std` in cpp files to after the
header includes
* Make coordinating changes so it builds again.
Qt6 builds on Windows were breaking because of namespace collision between
std::byte and some version of `byte` in one of Qt's namespaces. That breakage
is now fixed.
It would be good to systematically clean up all `using` declarations in header
files to ensure nothing is leaking out, but that's for another time.
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