* refactors konova/autocompletes.py by splitting into individual files and moving them to fitting apps
* autocomplete files now live in APPNAME/autocomplete/...
* adds codelist app
* adds KonovaCodeList and KonovaCode model for fetching and storing OSIRIS Codelisten entries
* adds update_codelist command for updating and fetching codes
* adds autocomplete route for using codelists in forms