* refactors table filters by introducing AbstractTableFilter, GeoReferencedTableFilterMixin, ShareableTableFilterMixin and RecordableTableFilterMixin
* adds full filter functionality
* refactors TableFilter inheritances for all objects
* adds rendering for detail view
* adds new includable html snippet for parcel rendering
* refactors generic includables in konova/ app into konova/templates/includes/...
* fixes bug where parcels have been reused from the database due to wrong model structure
* adds get_underlying_parcels() for Geometry model
* adds get_underlying_parcels() for GeoReferencedMixin models
* fixes bug where missing geometry would lead to an error during geometry conflict check
* removes unused wfs attribute from AbstractWFSFetcher
* adds/updates translations
* fixes bug in GeometryConflict conflict checking
* WIP: introduces new konova/utils/wfs/spatial holding SpatialWFSFetcher, which can be fed any geometry and it returns found features
* WIP: adds tests for wfs fetching
* updates requirements.txt
* removes unused messages
* adds geometry conflict message rendering for KOM and OEK
* removes unused methods in GeoReferencedMixin
* generalizes geometrical lookup for conflicts from overlaps to intersects
* refactors geometry field into GeoReferencedMixin, holding more handy methods and used in all models, formerly holding the geometry field
* refactors backend admin configuration, so modified, deleted and created are not editable in the backend which also skips loading of all possible choices
* fixes typo in sanitize_db command
* introduces GeometryConflict model, holding a link between two geometries, where one overlaps the other
* adds first (WIP) messages into detail views of ema and intervention for test purposes
* adds file mime type check on NewDocumentForm
* adds file size check on NewDocumentForm
* adds is_xy_valid methods as classmethods on AbstractDocument
* adds translations for error messages
* updates help text on NewDocumentForm file field
* moves updating of shared access users into ShareableObjectMixin
* renames ShareInterventionModalForm to ShareModalForm since it's used for EMA and eco accounts as well
