Parse input/output lines that contain an expression

[mattibat]

The input/output regex didn't allow quotes inside the parentheses, so output("Hello " + name) (the example from the docs and the editor demo) was parsed as a plain statement, and Python got output("Hello " + name) verbatim.

Now:

• It is parsed as an input/output node. A lone string literal still loses its quotes as before; anything else is kept as written.
• treeToPseudocode no longer wraps text that already contains quotes, so the pseudocode stays stable when switching between diagram and code.

Every line that was recognized before parses to the same node and serializes to the same pseudocode.

[mikebarkmin]

thx