Fixes #29

[AhmedHamdiy]

This pull request includes changes to the CTAlternateArray2D class to improve the iteration methods by making them more efficient and readable.

• CTAlternateArray2D >> allPositionsDo:: Replaced the call to firstPosition pointTo: self dimension do: with nested loops iterating over the height and width, directly applying the block to each position.
• CTAlternateArray2D >> allPositionsWithin:from:: Simplified the method by using ranges for x and y coordinates and collecting points within these ranges, instead of calculating top-left and bottom-right points and iterating over them.

[AhmedHamdiy]

A more efficient solution was to add this method to the [Point] class in the [Kernel] package.

 pointTo: endPoint do: aBlock

    "Evaluate aBlock for each point from the receiver (start) to endPoint, inclusive, in row-major order."
    
    | startX startY endX endY |
    
    startX := self x.
        
    startY := self y.
        
    endX := endPoint x.
        
    endY := endPoint y.

    startY to: endY do: [ :yIndex |

        startX to: endX do: [ :xIndex |

            aBlock value: (xIndex @ yIndex)
        ]

    ]