change whonix source indentation

[Patrick]

Use editorconfig

Continuing the discussion from change whonix source indentation: I would like to recommend the use of editorconfig. Developers don’t write with the same indentation size or character (tab, spaces), this makes every contributor render it differently on their editor or write with their own preferences. This is not good for uniformity. For supported editors, editorconfig enforces a set of rules for uniformity. Landing page Spec Personal example