Keep line-endings normalized & configure text editors to follow Limnoria style guidelines

[Mikaela]

As .gitattributes was already there I thought it might be a good idea to add end-of-line normalization of git from this decade.

• https://www.git-scm.com/docs/gitattributes#_end_of_line_conversion

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When writing #1560, I noticed that my nvim was making tabs which is against Limnoria's style guidelines. Thus I added .editorconfig that follows the Limnoria style guidelines so supported editors and plugins will automatically attempt to use four spaces as indentation and stay within 79 lines.

I am not sure if I should add it to .gitattributes as export-ignore, because someone could download the repository archive and send a patch by email or pastebin and thus benefit from .editorconfig being present.

I think copying it to repositories containing plugins would also be a good idea.

[progval]

Makes sense, thanks

[progval]

Suggested change

	[*]
	[*.py]

[Mikaela]

This wouldn't have helped with #1560 as requirements.txt wouldn't match *.py and thus my editor would have made tabs there. How about 49f9cdc instead?

[progval]

thanks!