Allow tasks to specify if they should use stdin or stdout directly

[corang]

Is your feature request related to a problem? Please describe

There are times when using maru-runner that I'd like to run an interactive application or an application that rewrites lines (say it has a progress bar). Any interactive application is a non starter because stdin is not bound to the commands maru-runner runs. In the case of an application that rewrites lines you either have to hope the application has a (competent) ci mode or just deal with terminal spam when line rewrites happen.

Describe the solutions you'd like

1.

• Given maru-runner is running a task with an interactive command
• When interactive is specified in the task
• Then the command is bound to stdin and stdout directly and the spinner is disabled

2.

• Given maru-runner is running a task with a command that rewrites lines
• When noSpinner is specified in the task (this is a bad name there's def a better one out there)
• Then the command is bound to stdout directly and the spinner is disabled