Make piping Exa's output leave out the icons if you added --icons.

[Oglo12]

Hello, I have Exa aliased to ls, but I can't help but be bothered that piping exa --icons to another program includes the icons! I know that there is a way to fix this, after all, there is another Rust program called Bat that does this. Anyway, it would be really nice to have this fixed!

Example when piping into FZF:

[eggbean]

Yes, it even adds icons with the -1 switch, which is a bad oversight. I don't use --icons myself.

[kirll-lappo-dg7]

I think it would be better to make --icons option work the same as --color option.

For ex:

--colo[u]r=WHEN    when to use terminal colours (always, auto, never)
--icons=WHEN       when to use icons (always, auto, never)

To make it compatible, auto can be a default value when just --icons is specified.