Add h and l navigation keys

[Bahaaio]

Hey, could you please add h and l navigation keys in addition to tab, similar to how bluetui handles it? Thanks!

[nsvke]

Hi,
I can implement the h/l navigation logic later today when I'm at my desk. If no one else is currently working on it, I'd like to take it.

[pythops]

Let's see first how many people want this. I personally don't use it. I need to see enough people wanting this to accept the changes.

[nsvke]

Fair enough. I'll keep the PR updated in case people show interest later. Thanks!