Devlog #18: You can save your work now!
There are now two buttons in the bottom-left corner: Open and Save.
Your projects are downloaded as .cirkuit files.

This part was actually quite challenging, mostly because of the file format validation and all the tests around it.

Next steps: clean up the code, cleanup the UI (it feels a bit messy right now), add a demo project, add copy/paste and selection, and add a clock