ADD --console-title-prefix command line option OR more formatting for --console-title

[allanlaal]

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2020.03.24
• I've searched the bugtracker for similar feature requests including closed ones

Description

minimal use case:

I wanna prefix the terminal title with my own prefix (static string) that signifies which youtube-dl alias is running and whats it doing

**myprefix** youtube-dl 1.5% of 67.69MiB at 3.09MiB/s ETA 00:21

paradise level use case:

complete terminal title formatting for --console-title with all the variables that --output supports