Android 1.1

I'm slowly adding features to Android as I figure out how to wrap up Star Shaped Bagel.

I've added pinch-zoom and also set the zoom to maximum to start off. I'm also experimenting with pace and refactoring the code bit by bit.

Serialisation is still a long way off as there's so much data to save. But compared to Six Match the code is much more readable, seeing as it doesn't pre-date sprite renderers in Unity.