New bot features

[simonostendorf]

• /stats command: more information (semester etc.)
• support higher semester
• "Beim Auswählen der belegten Fächer sind 10 Sekunden insane lang. Macht ma 2 oder so pls" (see Discord)
• Add Master study programs (see Discord)
• Add /tag where users can add information on their own (see Discord)
• Add /saft command https://www.youtube.com/watch?v=bx1vOD1jlN8