add support for emacs keybindings

[Ryooooooga]

• PR Description

resolves #1783

Support emacs keybindings C-W, C-Y, and C-K.

jesseduffield/gocui#16

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go run scripts/cheatsheet/main.go generate)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[jesseduffield]

Tested locally, works great!

[uloco]

Really looking forward for this being released.. I unfortunately couldn't find any info about upcoming releases. Is there any eta of the next release or some direction you guys could point me to? thanks :)

[jesseduffield]

@uloco we need to get a better release process. At any rate I've just cut a new release now: https://github.com/jesseduffield/lazygit/releases/tag/v0.36.0

[uloco]

@jesseduffield omg thank you so much!