[app] no need for run to be static; use constructor. #376
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This is a nasty pattern. Instantiating an instance to the app in a static method straight up feels wrong. Promoting a pattern where the caller might not even get a copy to the app object in case there's a need to interact with it feels wrong.
I'd rather have the caller instantiate and then launch the run routine explicitly.
There's room for a bigger refactor, but this PR should suffice to get rid of the anti-pattern.