Use EditorConfig in all IDE that support it - like Elasticsearch.

See http://editorconfig.org/

All we need to do is add a `.editorconfig` to the root of logstash (and perhaps all the plugins when we next do a mass edit)

There are plugins for most IDE/Editors

Example file from https://github.com/elastic/elasticsearch/blob/master/.editorconfig

```
# EditorConfig: http://editorconfig.org/

root = true

[*.java]
charset = utf-8
indent_style = space
indent_size = 4
trim_trailing_whitespace = true
insert_final_newline = true
```