Configurable indentation size

[RealityAnomaly]

I prefer to indent my Nix expressions with four spaces rather than two as I find it more readable. It'd be nice to have this as a command-line option you can specify, with two as the default.

[quantenzitrone]

yes and a tabs option please preferably even respecting the settings in .editorconfig

[infinisil]

While it has been configurable for a while using -w, since #118, it's a soft limit, and not a hard one. We should also implement a way to configure the hard limit now.

[quantenzitrone]

-w is for line length not indentation

[dasJ]

Yep sorry, that was an oversight on my side :/

[infinisil]

Ah I see, makes sense!

I guess for that we should use editorconfig's indent_size