[OE-4103] -  Refactored migration
[OE-4103] -  Refactored episode sidebar, Event and Episode models
[OE-4103] -  Refactored event container, style and base type controller
[OE-4103] -  Refactored based on generic requirement -> Formatting of edit form needs improving
[OE-4103] -  Refactored based on -> Should only be displayed on event view if different from event creation date
[OE-4103] -  Refactored based on -> Backdated icon (in sidebar) needs improving or removing
Merge branch 'jira/OE-4103' into develop