Add support for .editorconfig files

[martinribelotta]

The .editorconfig file apear as a standard form to share configuration between different IDEs.

See: https://editorconfig.org/

This approach need:

• Recognise and load .editorconfig file format (ini parser)
• Optional save current relevant configuration to .editorconfig in actual project file base
• Add per-file configuration extracted of respective .editorconfig database