* refactor progress bars
* use fmt to better format progress bars fields
* add a Chrono class to handle time and status/state
* add a ProgressBarRepr class to handle representation of the bars
* add capability to remove progress bars from a manager
* add capability to set width when computing bars repr and printing
* handle no_progress_bars context value in all situations
* also ensure quiet, not a tty, and json modes are handled
* add and update tests
* make it optional to display sub-bars in aggregated mode
* display a carrousel of downloading or extracting packages is the aggregated bar
* make sure extracting packages from cache are printed by the progress bars manager
* remove postfix when printing the completed download status
* protect chrono state against modifications when sorting bars
* fix to_human_readable_filesize free function
* only wait for watch_print thread to exit if started
* store speed, also compute average speed from member or Chrono elapsed time
* use the average speed on download aggregated bar if cURL info is missing
* allows to get average speed on total elapsed time
* improved color scheme of progress bars
* collect and show the in-progress status using cyan
* init the progress randomly when activating spinner
* control sorting of multi downloads using an option
* use C-style options also for fastfail
* make sure pbar manager is init on multi bars when dl channels
* refactor on api changes
Adrien Delsalle