Generate gridded square piece puzzle from image

[pv33]

Conception:
Subclass of gridded that provides its own template based on width/height specifications in terms of the grid and in terms of the image. Uses the two numbers to generate a proper puzzle template, which in this case might actually be region labels over the entire image, otherwise there will be boundary line artifacts unless we keep them.

A sprint-based approach would go with line artifacts as a first pass, then provide one without lines. Not sure what Adan and Heather would think. The best is to have a visually continuous puzzle since the problem is that of quality control.

• Based on a mask image.
• Based on region label image.

[pv33]

Was thinking of sub-classing from Gridded, but it is derived from Interlocking, which the QC puzzle will not be. Will change to class name of Matrix and derive from Adjacent. Matrix puts things into rows and columns, which this follows. That means the API does not have to conform to a Gridded but can be used as a template for coding things out.

[pv33]

Add a force sizing option so that the image and grid result in square cells.