Added better sprite class
Added SequencedImage class
Added timer to SequencedImage
Added smooth img rendering as opt_param
Now each frame of a sequenced image can have its own display duration (SequencedImage.frames[].freq). If one is not provided for the cell, it will default to the class freq
Documented some ideas
Entity can have std size, or instead can define width and height as null, but define a scaling amount. If the later is used, then the size of the sprite is used, which is then scaled by the entity's scale value
Added animated sprites implementation. Still needs lower level logic