Issue/570 remove geo widget

[Floris272]

Fixes #570

Changes

• removes geodadminMixin & sets the widget for geometry fields to TextArea
• Fixes issue added in ✨ [#550] Add cache to retrieve versions of objecttypes #571
  • check_objecttype_cached from core/utils is called in by the admin & the api, the errors return "non_field_errors" as the key, which DRF uses by default.
  • The admin however only allows fields of the model or "__all__".

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (524f40a) to head (edb2038).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #581   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files         147      147           
  Lines        5113     5119    +6     
=======================================
+ Hits         4840     4846    +6     
  Misses        273      273           

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