[Feature request] Customize keybindings

[chrisgrieser]

Is your feature request related to a problem? Please describe. In most other apps I use (editor, launcher, fzf etc.) I use tab to go down to the next result and s-tab to go to the previous result. Omnisearch is pretty muc the only plugin not being consistent with that.

Describe the solution you'd like Options to customize:

• which key goes down
• which key goes up
• which key toggles in-file-search

Describe alternatives you've considered Cannot really think of any?

[scambier]

Related: #171 #191