Parse&Show test dates

[ScDor]

Is your feature request related to a problem? Please describe.
A student choosing courses may want to avoid ones whose tests take place on the same day, or adjacent.

Describe the solution you'd like

• Parse test dates of courses, add them to the Course instance
• When parsing is handled, show the test dates ("moed aleph/bet" dimmed (greyed?) on the FE, and color them red if one taken course is too close to another (perhaps let user choose number of days between tests that would be too close for them)
• Important note: coures have different test dates on different years! This would require synchronizing the studesnt's year_in_studies with the data_year, so we know which course is taken on which year. This may require downloading and synchronising data from previous years.