Fifteen Sliding Puzzle maker

Added the ability to move multiple blocks in a column and row in one move.

An interesting moment, when I did something similar 10 years ago, in the terms of reference this function was indicated as the most important.  All implementations of this game that I have seen while working on this project did not use this function, but I think that it is really very useful when solving the puzzle, especially if the picture is large.

If you are interested in this editor or would like to support me, I would be very grateful if you would star him on GitHub: https://github.com/Kirilllive/Fifteen_puzzle_maker  This will greatly help my business grow and I will be able to create more interesting tools.