Add an option to export data

[JoshDoesStuff]

Since the data is stored in the browser, it would be nice to be able to back up the indexdb and localstorage stuff for restoring when I clean my system

[AguzzTN54]

I don't think I need to add this feature, but if a lot of users need it, I might consider it

[undrewatre]

Agree, I want this too.

[AguzzTN54]

Alright, I'll work on it, I hope everyone can wait patiently.