citra-qt: Add helper function to get a monospace QFont

src/citra_qt/util/util.h

@@ -0,0 +1,8 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <QFont>
+
+/// Returns a QFont object appropriate to use as a monospace font for debugging widgets, etc.
+QFont GetMonospaceFont();