V0.3

Big change:

• Line linking!

Smaller changes:

• Improved the save-load system to be more performant by changing the serialization backend system.
• Made the camera be able to be zoomed out further. 
• Improved usability.
• Fixed the Clear context menu.

What's next?

• Editing line end points (a draggable widget, coming in V0.31)
• Drawing. (coming in V0.4)
• Changing note size per-axis (coming in V0.4)