Improve scheduling

• Introduce and visualize default slots
• Introduce interface to easily create/edit default slots
• Create new CVs/warnings based on default slots (moved to #163)
• Improve scheduler to use more of the available space (introduce "fullscreen" view?)
• Directly visualize violations and warnings in scheduling view
• Add reload button to scheduling view

To remove code duplication, this introduces a new version of the availabilities editor, too (this implements #93 (closed)). With this, all calendar inputs use a common fullcalendar v5. The new availability editor code can be reused for the default slot inputs.

AKModel/availability/models.py

@@ -21,7 +21,7 @@ zero_time = datetime.time(0, 0)
 # remove serialization as requirements are not covered
 # add translation
 # add meta class
-# enable availabilites for AKs and AKCategories
+# enable availabilities for AKs and AKCategories
 # add verbose names and help texts to model attributes
 class Availability(models.Model):
     """The Availability class models when people or rooms are available for.