Add hasCollision() (and it's dependencies) to check collision based on pixel #6
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This is an implementation of per-pixel collision, which can be used for any textures with any shapes.
This method uses alpha map, which the alpha channel value of every pixel in the texture are stored in it. It also can be used for rotated textures, or textures with resized SDL_Rects.
It may be still buggy. It's good to check it before merging.