Introduce a score or a badge system for lectures

[fosterfarrell9]

With the increasing amount of lectures that are available in production, it can happen that lectures which make use of a lot of features of MaMpf (like tagging, structuring with chapters and sections, tables of contents and references for videos, quizzes...) are overlooked in a sea of lectures that do not. One way to improve the situation would be to calculate some kind of score that measures the above things and award badges to lectures depending on this and enable users to sort accordingly.