Reduced unnecessary high swap number

[SheikhWalter]

I was looking in this project trying to understand how the code works for a personal project, and in my version I needed every single slight optimization I could do -It's a computer vision project-.
So I started tweaking with the parameters, and then I saw const SWAPS_PER_GENERATION_PER_PIXEL: usize = 128;.
I tried lowering it thinking it would improve the algorithm more with the tradeoff of the accuracy, but I was half correct..
Yes the performance was improved, but here's the thing.. the accuracy barely changed!
Then I added a widget to display the processing time to test even further.

And here are my test results:

• Best value: const SWAPS_PER_GENERATION_PER_PIXEL: usize = 8;
• Higher than 8: it becomes slower because of the number itself
• Lower than 8: it becomes slower too but because the assignments vector updates each iteration -necessary for dynamic image display-

If you want to see comparisons proving my point, here you go:

• SWAPS_PER_GENERATION_PER_PIXEL = 128 (Resolution = 128) Took 4.671s
• SWAPS_PER_GENERATION_PER_PIXEL = 8 (Resolution = 128) Took 1.972s

Notice how it now runs much faster while maintaining almost the same output

• SWAPS_PER_GENERATION_PER_PIXEL = 4 (Resolution = 128) Took 2.164s

Now it began to run slower (assignment vector update overhead)

• SWAPS_PER_GENERATION_PER_PIXEL = 2 (Resolution = 128) Took 2.737s

I made the same test with Resolution = 256, you can look at it in the Tests folder