Add output redirection in release mode.

Debug mode gets outputted to std{out,err}. While most IDEs are sane
enough to capture the streams by default (hello, Qt Creator!), others
aren't (such as CLion, but there's a workaround there), and you can
forget about CMD output as well. Ugh, I hate Windows...

src/main.cpp

@@ -16,4 +16,17 @@
 
 #include "SaveTool/SaveTool.h"
 
-MAGNUM_SDL2APPLICATION_MAIN(SaveTool)
+#include <fstream>
+
+int main(int argc, char** argv) {
+#ifndef MANAGER_DEBUG_BUILD
+    std::ofstream output{"out.txt", std::ios::trunc|std::ios::out};
+
+    Utility::Debug d{&output};
+    Utility::Warning w{&output};
+    Utility::Error e{&output};
+#endif
+
+    SaveTool app({argc, argv});
+    return app.exec();
+}