Stop Format/STEP.hpp Defining a Global fs Alias (#16102)

Every file that included STEP.hpp, directly or not, got namespace fs = boost::filesystem at global scope, and 29 sources and three headers relied on it without saying so. Headers now spell out boost::filesystem, and each source that uses fs declares the alias itself.

src/slic3r/GUI/SyncAmsInfoDialog.cpp

@@ -78,6 +78,8 @@
 #include "DeviceCore/DevStorage.h"
 #include "FilamentBitmapUtils.hpp"
 
+namespace fs = boost::filesystem;
+
 using namespace Slic3r;
 using namespace Slic3r::GUI;