Multiple tabs

[yeboahnanaosei]

Hi, as always great handy app.

I think it will be nice if we could have tabs.
This way you can have different tabs for different code snippets you want to try.

There are times when I do not want to clear the current snippet in the app.

[unbelievableflavour]

I'm sorry I don't actively write code for this project anymore. If you have time you could write a PR and I could look at that for you and release it! The code is not that hard too understand.