.editorconfig support

[vrubleg]

Visual Studio supports .editorconfig file. It allows to setup all the settings which your extension provides, but in a bit more flexible way (you can set different options for different file types on per directory basis).

But it is buggy, it frequently mixes line endings in a lot of situations, and the developers of VS don't fix it for very long time. I have reported it twice:
https://developercommunity.visualstudio.com/content/problem/617952/vs2019-itself-creates-files-with-mixed-line-ending.html
https://developercommunity.visualstudio.com/idea/363894/mixed-and-inconsistent-line-endings.html

It would be nice if this extension detect that there is an .editorconfig file available, and just fix line endings according to what is specified in the .editorconfig. All the other things are already done by VS (adding a new line at the end, removing trailing spaces), but not unifying of the line endings.