both versions:
- added Horizon line and option to enable/disable "Horizon Assist" in Perspective Grid
- minor bug fixes
iOS version
- added 'Tilda' shortcut to enable Fullscreen mode on iPad with keyboard
- renamed menu item: 'Show Right Toolbar' to 'Show Colors Toolbar' on iPad
- fixed Lasso tool used with Feather or Smooth on large canvas sizes
- improved support of Bluetooth styluses