Indicate the scraping progress in percent in the log messages

[blu3r4y]

When scraping courses and bookings, we know how many there are in total, because we know the total number of rooms, and courses, respectively, beforehand.

• Modify the logger so that it provides a new "progress" column for a percentage number (right to the status column)
• Fill the progress number when scraping courses
• Fill the progress number when scraping bookins