autorandr: configModule.extraConfig

[zackattackz]

Description

Add an option to programs.autorandr's configModule to allow arbitrary extra config lines.

No option exists for adding arbitrary key/values to generated autorandr profile config, as is common in other nix modules. This commit adds one.

Checklist

• [x] Change is backwards compatible.

• [x] Code formatted with ./format.

• [x] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• [x] Test cases updated/added. See example.

• [x] Commit messages are formatted like

  {component}: {description}
  
  {long description}

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • [ ] Added myself as module maintainer. See example.

Maintainer CC

@uvNikita