Resolve "Autosave overwrites project edits"

The issue was fixed by disabling autosave when editing projects.

Another option would be to save unsubmitted edits to projects separately for each project, but it could cause issues if the edit page is loaded (without submitting the update) on machine 1, then the project is modified on machine 2, and then someone edits the project again on machine 1. In this case, the edits made on machine 2 would be lost because the unsubmitted edit from before would be restored.

Closes #600 (closed)

Closes #601 (closed)