Introduce .editorconfig and adapt code

[cemdervis]

To improve naming and formatting consistency across the project, an .editorconfig file should be introduced to the solution. The code should be adapted accordingly.

[drewburlingame]

This would be helpful. I was looking to contribute and R# is usually good at adapting to the conventions of the project but it is not handling the double space indent well, resulting in a lot of manual reformatting.

How long will you plan to support old .net framework and standard? If the next version supported only core, I'd be happy to contribute some modernization and cleanup.