Handle \r in the notebook

[davidanthoff]

Running

print("Hello World")
print("\r")
print("1234")

with a Jupyter/IJulia kernel results in output

1234o World

but running it in the extension Julia kernel results in

Hello World
1234

If we just handled the \r like the Jupyter/IJulia kernel did, things like ProgressMeter would look a lot better, at least in some basic use-cases.

@DonJayamanne and @amunger any suggestion on how we might want to do that? Is there special handling in the Jupyter extension for this that we could just replicate somehow? The code that currently handles this in the extension is

julia-vscode/src/notebook/notebookKernel.ts

Line 255 in 696ce50

({ name, data }) => {

, presumably we would want to change that somehow?