Quick add tasks

[JonasJurczok]

It would be awesome to have some QoL features to make adding multiple tasks easier.

Examples could be

• hitting ENTER in title field saves tasks and creates a new one

[hoylemd]

I think I can take a crack at this, next time I'm in a lua mood.

It's funny, I was thinking about this when I did the e to close thing, but figured "eh too much for one PR" :p