kakoune: add kakboard plugin

[loewenheim]

Motivation for this change

I think it's a useful plugin.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • Fits CONTRIBUTING.md.

[nrdxp]

This can be easily reworked to follow the new workflow from #108363

[loewenheim]

This can be easily reworked to follow the new workflow from #108363

How do I add a plugin? Just add the repo and name to kakoune-plugin-names and run update.py?

[nrdxp]

How do I add a plugin? Just add the repo and name to kakoune-plugin-names and run update.py?

That's it.

[loewenheim]

How do I add a plugin? Just add the repo and name to kakoune-plugin-names and run update.py?

That's it.

That also updates all existing plugins though, is that intentional?

[nrdxp]

That also updates all existing plugins though, is that intentional?

Actually it is, which is why I asked on #116485.

[loewenheim]

I updated my branch to depend on that PR, how should I proceed?

[SuperSandro2000]

I updated my branch to depend on that PR, how should I proceed?

I think you need to rebase it because github does not exclude the merged commits.

[SEbbaDK]

This was added and merged in #120264