Implement Autosave

[poef]

You shouldn't lose changes when navigating in SimplyCode.

• Automatically save changes in localStorage before navigating from a page
• Keep track of local changes
• Undo/Redo, per component
• Show save dialog with all your local changes, allow you to save a selection

[ylebre]

I'm not sure how this would work. If you want, could you provide some mockups on how this would work for the user? For the time being, I am leaning towards only implementing an 'isDirty' check that prevents navigating away when you have unsaved changes.