Overhaul of EditorConfig rules (#652)

Before this change we had 153 files on the main branch that did broke at
least one of our editorconfig rules. After this change, all of our files
honor the rules that are partially updated.

There are 2 places that are exempt from our rules:
- external libraries in src/bin/lib/
- debian directory in debian/
- test file from outside source in tests/extensions/

You can see the .editorconfig file in each of these directories for more
details.