Added ability to change the font size.

It mostly works. It's a little wonky sometimes but it will mostly change all fonts in the application to the size you set.

main.cpp

@@ -6,6 +6,13 @@ int main(int argc, char *argv[])
     QApplication a(argc, argv);
 
     MainWindow w;
+
+    QSettings settings;
+    int fontSize = settings.value("Main/FontSize", 9).toUInt();
+    QFont sysFont = QFont(); //get default font
+    sysFont.setPointSize(fontSize);
+    a.setFont(sysFont);
+
     w.show();
 
     return a.exec();