Progressbar always writing control characters to stdout.

[LennartC]

When you create a progressbar with pterm.DefaultProgressbar.WithWriter(os.Stderr) you expect all the output to go to stderr.

However, in this commit: bc8595a

cursor.Show() and cursor.Hide() was added, which always outputs control characters to stdout.

This is an issue when you pipe the output to another command for example. You'll end up with �[?25l�[?25h at the beginning of the output.

[lammel]

This is somewhat related to #261. The cursor used is atomicgo.dev/cursor which is not capable of handling stderr currently.

There is a PR atomicgo/cursor#7 open there which needs some more love to be merged probably

[MarvinJWendt]

Hi, I have updated cursor to support custom writers for the area. This could now be worked on.