Establish a consistent code style and auto-formatting

[jopperm]

I'd like for us to decide on a code style, export the Eclipse's auto-formatter settings and add them to the repo, have that one terrible commit that reformats everything, and then make it mandatory to auto-format new changes.

[jopperm]

Personally, I like:

for (int i = 0; i < someUpperLimit(); ++i) {
  // spaces for indentation
}

... but will be fine with any style as long I can have a tool apply it.

[jopperm]

Will look into using an .editorconfig instead, if that's supported well by Eclipse's auto-formatter.

[eyck]

Actually there is no XTend formatter outside of Eclipse and Eclipse does not know anything about .editorconfig. AFAIK setting this up requires a XML file to be imported into the setting. The better way would be to use the MINRES Oomph setup which may provide this. I'll have a look into this and provide a proposal...