Save search history

[strugee]

I frequently search for the same thing in Gelli. It would be nice if, when I tapped the search icon, Gelli showed a list of my previous searches. In order for this to work properly though I think probably it would have to only search when you tap the search icon in the keyboard, because otherwise if I typed e.g. "foo bar" into the search bar, there would be one history entry for "foo" and another for "foo bar".

It would also be nice if this was synchronized with the server one day, but obviously that would require server changes and this would still be useful even locally.