PartialClassExtractor can handle newlines wrong

[Boereck]

If the CodeConfig defines a lineDelimiter that is different than the system one, then org.eclipse.xtext.xtext.generator.parser.antlr.splitting.PartialClassExtractor fails to do extractions, because it assumes the files it works on were generated using system line breaks.

I guess a fix would be to pass the CodeConfig or the delimiter itself into the PartialClassExtractor constructor and use the delimiter instead of Strings.newLine().

[cdietrich]

@szarnekow wdyt

[szarnekow]

I'd rather support all line delimiters in the PartialClassExtractor instead of just the system's or the one passed into the ctor.