Add .editorconfig

[prusnak]

This PR adds an EditorConfig config file which might consolidates whitespace usage eventually across the project:

• remove trailing whitespace
• insert final new-line
• end-of-line is LF
• charset is UTF-8

I didn't change any files afterall, because this would lead to lots of merge conflicts. But if contributors' editor supports this, they will create consistent files.

[ConorOkus]

Hi @prusnak ,

I think having something like this in the project would be very nice.

Can you explain how we would enforce this though? Does it get run at build time?

From what I understand an editor like visual code has a plugin that supports this which ensures the file is formatted on every save but not sure how it works in other editors.

What does it look like over the longer term, would we need to define formatting per file type? I see the rules you have put in by default just cover mainly spacing.

Does it make sense to have something with stronger linting? e.g http://www.plainionist.net/Plainion.JekyllLint/

[prusnak]

From what I understand an editor like visual code has a plugin that supports this which ensures the file is formatted on every save but not sure how it works in other editors.

There are lots of editors that support this out of the box - see https://editorconfig.org/#pre-installed

Another bunch of editors require a plugin - https://editorconfig.org/#download

This is not enforced anywhere (yet), because this would make lots of people unhappy (failing CI, etc). But when an user with editor respecting the file saves the file, the settings will be applied.

[prusnak]

Does it make sense to have something with stronger linting? e.g http://www.plainionist.net/Plainion.JekyllLint/

You can surely apply linters for markdown, html, etc. But this is out of scope of this PR.