Search query should be remembered for next run

[martinvonz]

less remembers the last thing you searched for so you can just press "n" to search for it again next time. It would be nice to have the same feature in streampager.

[markbt]

I don't think I'd ever used that feature of less before. We do have the search history (/, Up), so it shouldn't be too hard to implement this.

[martinvonz]

Ah, I didn't realize that you had search history (nice!). Just n is still a nice shortcut, but /,Up is good for now, thanks.

[markbt]

When I get round to this, I should also add shortcuts for "jump to next/prev match relative to the current screen position" (cc @quark-zju).