Add Eclipse formatting settings xml file

This pull request adds a formatter profile for Eclipse followning the official code conventions for the Sponge Project -> https://docs.google.com/document/d/1afZMMsU9yODX6d6WZAiKnabMbkuDXa_3ulsuDKZcfxg

It was created by exporting the checkstyle.xml via the Checkstyle Plugin to a Eclipse Formatter profile.