Show announcements in "My plan"

Closes "My Plan" in #63

aleksis/apps/chronos/templates/chronos/my_timetable.html

@@ -26,7 +26,7 @@
 
   <div class="row nomargin">
     <div class="col m12 s12 l6 xl4">
-      {#            {% include "timetable/hintsinplan.html" %}#}
+      {% include "core/announcements.html" with announcements=announcements %}
     </div>
   </div>
 

aleksis/apps/chronos/views.py

@@ -77,6 +77,7 @@ def my_timetable(
         context["day"] = wanted_day
         context["periods"] = TimePeriod.get_times_dict()
         context["smart"] = True
+        context["announcements"] = Announcement.for_timetables().at_date(wanted_day).for_person(person)
 
         context["url_prev"], context["url_next"] = TimePeriod.get_prev_next_by_day(
             wanted_day, "my_timetable_by_date"