Added a 'snap to fine grid' feature.

I've added a 'snap to fine grid' feature. It allows for snapping to sub-tile divisions.

This feature was made as I was tired of having polygons and other objects having untidy shapes and alignment, or being restricted to only tile corners if I wanted things neat and tidy.


I'm not sure if the changes for the UI are any good, but they are functional.

The fine grid is configurable in preferences. The snap to fine grid is toggled under the view menu. Holding down control will always disable snap to fine grid.