v1.17

Changes:

• also show projects on plans map
• vectors instead of tiles for all maps
• organisations get a type
• new fields district, point and topic for projects, currently only
  shown in the dajngo-admin
• associated plan is not required anymore to publish project
• new field identifier (Bezeichner) for bplan to be added via the api
  (imperia) or our dashboard
• management command to automatically get the point and district from
  bplan-prod.liqd.net for existing bplans
• task to automatically get the point and district from
  bplan-prod.liqd.net when something is changed in a bplan
• accordeons addable to landing page
• the possibility to add a storefront to the landing page
  • storefront with random choice from at least three project,
    district or quotation tiles
  • storefront with all items for all projects counted
• grey check in dashboard if project is not yet published
• different issue fixes
• wagtail, webpack and more packages updated