WIP: Updated the default context

[jesper-friis]

Description

Updated types in default context. Several data properties have been change to object properties to ahead to the DCAT, DCAT-AP and DCAT-AP-NO recommendations.

Todo: Also update the documentation accordingly.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.87%. Comparing base (f6f859c) to head (6f26395).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #297   +/-   ##
=======================================
  Coverage   76.87%   76.87%           
=======================================
  Files          22       22           
  Lines        2469     2469           
=======================================
  Hits         1898     1898           
  Misses        571      571           

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