Fix up std:: namespace hygiene.

* 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.

1 files changed, 2 insertions, 2 deletions

diff --git a/boardparameters.h b/boardparameters.h
index 299c34c..b05d4b3 100644
--- a/boardparameters.h
+++ b/boardparameters.h
@@ -30,8 +30,8 @@ public:
 	BoardParameters();
 
 	// Does not serialize name...caller still has to get/set name manually
-	void Serialize(ostream &stream);
-	static BoardParameters *Deserialize(istream &stream);
+	void Serialize(std::ostream &stream);
+	static BoardParameters *Deserialize(std::istream &stream);
 	
 	int width() const;
 	void setWidth(int width);