Support for keymap (langmap)

[shagohead]

When keymap is turned on, it is not working in lightspeed

P.S. I do not know, but maybe root of this issue is the same to #137

[shagohead]

P.S. Thanks for a great project. I used Sneak and EasyMotion years ago. Lightspeed perfectly combines the speed and convenience of Sneak and fast transition to long distances in the presence of a large number of matches of EasyMotion

[shagohead]

Used text is:

Сегодня, я вижу, особенно грустен твой взгляд,
И руки особенно тонки, колени обняв.
Послушай: далеко, далеко, на озере Чад
Изысканный бродит жираф.

Options:

keymap=russian-jcukenmac

[ggandor]

In Sneak this works, but I had a hard time understanding that part of the code, I will make another attempt sometime. (PR-s are welcome too.)

[ggandor]

Note: check leap.nvim, if you haven't already, keymap support is implemented there. It cannot be copy-pasted to Lightspeed though, because of the jump-to-unique-characters feature.