Merge pull request #4 from luyor/Game-Engine

Game engine
Merge pull request #5 from luyor/Game-Engine

change comment style(comment over implement)
Merge pull request #6 from luyor/Game-Engine

add paint_area in data.h
First Edition
Merge pull request #7 from luyor/UI

First Edition
Merge pull request #8 from luyor/Game-Engine

change collision checking
Merge pull request #9 from luyor/Game-Engine

fix background naming problem
针对我没法正常push的调试
Merge pull request #12 from luyor/Design

针对我没法正常push的调试
change .pro