Add 'Tildes With Keyboard' module

[SoptikHa2]

Could you add module that would allow users to use Tildes with keyboard, without need to use mouse?

Features:

• Use arrow keys to go between topics in main view (arrow keys to select topic, enter to follow link, c to go to comments), something like DuckDuckGo.
• Use F2 button (or something else) as command line -> press the button and command line will appear. User will type command and it will do something (~comp go to tildes.net/~comp, p create new post, etc) (like RES).

[theCrius]

I was thinking about that some time ago but other stuff got priority over it.

It's an interesting thing for sure and I never did something like that in JS so, sure I'll give it a go. There are a couple of feature requests queued up so I'll check out the priority but it's going to happens.

[Bauke]

Made a PR for this issue, check out the tasklist for the potential functionality. If you'd like to see anything added or changed just add a comment here, I'll add it to the tasklist.