Code folding in the output window for each selection submitted to an interpreter and its output.

[arizvisa]

It'd be pretty neat if we could create a fold for the previous output when a selection gets submitted to the interpreter. This would simplify hiding results that aren't relevant anymore. We could probably use nested folds..one for the input/output pair, with nested folders for the individual input/output components. This'd make it pretty similar to Mathematica's "cells" as per the notebook interface.

I'm not sure if this'd actually be possible for external interpreters, though, since we don't really have a signal that we can monitor for when the interpreter has done its thing with our input.

[arizvisa]

This can't be done against buffers that have their "buftype" set to "terminal". This means that this will only be possible when using the internal or external interpreters