less: enable options to be specified multiple times

[bmrips]

Description

This PR fixes two things in the programs.less module:

• Enable an option to be specified multiple times by assigning a list of values to the option. While the machinery works, this is currently limited by the type of the option.
• The --color/-D and --prompt/-P options need to occur in a certain order (see the comments in the code and the less(1) man page for more information)

Checklist

• Change is backwards compatible.

• Code formatted with nix fmt or
  nix-shell -p treefmt nixfmt deadnix keep-sorted --run treefmt.

• Code tested through nix run .#tests -- test-all or
  nix-shell --pure tests -A run.all.

• Test cases updated/added. See example.

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  • Basic tests added. See Tests

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[teto]

if order matters, maybe "options" should be made into a list instead of an attrset. I applaud what you've done but I fear this makes more complex. Let's see what @Pamplemousse thinks

[khaneliman]

if order matters, maybe "options" should be made into a list instead of an attrset. I applaud what you've done but I fear this makes more complex. Let's see what @Pamplemousse thinks

List or using lib.hm.types.dagOf with the attrs should work instead of manually separating and managing attrsets like that.