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This changes a lot of the render methods to return strings instead of directly calling setContent. It does result in some repetitive code which could probably be refactored to be cleaner. I'm happy to do that if you would like.
The benefit of that is that partial views can render without calling setContent. They do have to be echo'd now which is a change to their usage, but I just couldn't think of a solution that kept their current usage without rewriting the entire thing. I took the easy way out. :)
I also added a test case for multiple partial views and modified the rest of the views tests so that they pass on Windows. Using PHP_EOL instead of a hard coded "\n" should let them pass on Linux and Windows.