[optional] add hold functionality #9
Description
Create a variable that stores the hold piece.
The function consists of storing the currentShape using the previously saved piece if none was saved before, if it's the next prediction (ref #6) will be used as a replacement.
Important Note: You cannot hold more than 1 time per lock; this means that once you hit the hold button (which is C most of the time), your current piece will be replaced and you won't be able to hit hold again until your piece is locked.
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