class Block

This class represents a two$-$dimensional tetris piece dropping into the tetris well. Figure $1$ depicts some examples of

pieces. The block is practically a square$-$size placeholder for the Tile objects. But not all the spots are necessarily

occupied. When the block is generated, we randomly pick the spots that will be filled in with tiles. All the tiles of a block

must have the same color. Lastly, the block is dynamic which means that while it$$s dropping into the well it can transform

in the following ways:

$$ It can move left or right $($one spot at a time$)$

$$ It can flip vertically or horizontally

$$ It can rotate clockwise $(90$ degrees at a time$)$

$$ It can scale up $($double in size$)$ or scale down $($shrink in half, but can$$t become smaller than $2$x