Improve code formatting settings

[odrotbohm]

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Editorconfig?

[bkieling]

The current .editorconfig contains common properties and those special for IntelliJ trying to get close to the current Eclipse formatting and import order.

The file will be picked up automatically by IntelliJ. There is still some different formatting, esp. around chained method calls, which should be marked with // to avoid reformatting.