Added My Other Game

I'm currently working on two games at once. One is Square Runner as I've previously posted. The second is a car defense game that I'm designing with my friend Seung in South Korea. Check it out on the Car Defense page!

List of changes:

GagsEngine:

• Added a FrameTimer utility that handles time-based events

Car Defense:

• Lowered the speed of the zombies
• Use the Timer to generate zombies randomly (Random zombie type, random spawn point) every second
• Bullets destroy themselves when their target is killed