Winter can leave people feeling tired, run down, and just plain crabby. However, there are apps that can help turn that frown upside down — and a whole lot more —  as PC Mike Wendland reports. The app called Happify includes games and activities proven effective in helping users become happier and more optimistic. Set goals in different “tracks” of your life, such as helping you improve your confidence. Activities are often as simple as asking you to list things you are grateful for or noticing positive words in a game and avoiding negative ones. The app is free for iOS and Android with premium features available for purchase. Live…