[adv_windowlist] navigation keys as in vim

[g4570n]

It would be great if you could navigate the channel list in AWL with keyboard shortcuts (ex: when all the channels you are joined to are no longer visible in the screen view), in a similar way to how it can be done with the tmux-nicklist-portable.pl script.

For example:

k/up arrow: up one line
j/down arrow: down one line
u/pageup: up 50% lines
d/pagedown: down 50% lines
gg: go to top
G: go to bottom