Made buttons larger
Fixed issue when drawing to left of centre line
Changes to grab tool after drawing a new line

Fixes printing designs.

This huge update includes:
  * Dimensions - diameters, vertical and horizontal
  * Imperial and metric dimensions
  * You can now print your designs
  * New "wrap" allows segmented turning
  * Improved more realistic viewer

Fixed a bug with undo, and improved the handling of camera permissions.

Added a new curve tool to make designing beautiful turnings even easier.