Auto-save (again)

[jmcaine]

Forgive me if I've missed this and the answer is "already there".

I toyed with enable_auto_save - it works well, especially with the fix to the UI that you swiftly committed awhile back.

But I've been using growing fond of 'zig build --watch -fincremental' for some workflows, so I can't use auto-save because I want to dictate my save time, since it fires an incremental compile.

However, I'd like backups. Have you thought about x-minute backup schemes, for restore purposes in case of crash? This would check all my boxes!

[neurocyte]

This is actually 90% implemented because it is already used for the restart feature. All that is needed is a timer to save the restore info every so often.

[jmcaine]

Wow. Life is good!

[neurocyte]

See #418