Romance tags

I added romance tags to choices (little hearts), but you'll have to start the story from the beginning if you want them to show properly; you can switch them on/off in the settings, and they're off by default.

I also added one variable to the third chapter which I'd thought I wouldn't need, but alas; it means you'll need to replay the third chapter. Sorry about that! I'll add this note again to the next chapter update post so readers don't forget about it.