1.2.0 - New Puzzle Size Options, Zoom Function

I've been working on some new features, and I'm pleased to be able to publish this update!

There are now 7 new puzzle size options, bringing the total from 8 to to 15. Now, we can complete puzzles of up to 400 pieces!

To complement these new puzzle size options, I've also added a simple 'camera zoom' feature.

This is the first implementation of these features, so please let me know how you find them. Let's solve some more challenging jigsaw puzzles!