6.1 beta 13 - easier page copying, stroke icons

[ben]

Changelog:

• The Share button in the top-right toolbar now lets you copy a page or share it as a PNG
  
  
• Added some stroke icons for the new iOS 17 ink tools, rendering improvements for the other icons
• Removed OneSignal (push notification provider)

Known issues

• In iOS 17, Text Notes cannot be moved (Brandonschwrt)
• In iOS 17, the lasso tool doesn’t work