Integrate events with frontend editing

As a frontend user I like to create events

AC:

• creation is only allowed for logged in users
• new events are hidden by default
• events are visible, if an event of this fe_user was accepted in past

Todos:

• build a form to submit events (currently done via ext:form)
  • basic event data (information, category, images)
  • hidden if fe_user has no approved event, not hidden if fe_user has approved event
  • define mandatory fields
  • configure correct filemount for event records(?)
  • allow to configure event date and TIME
  • Location. Propose: suggest with Google Maps API Search and already existing records
  • Skills. Propose: Textarea - one skill per Line?
  • RTE for description (others?)
• generate Slug for created event record (Finisher?)
• Backend Module for easy approving?
• start-/stoptime to create an event that should not be published yet
• possibility to edit?