Updates to Wikidata script

[Teester]

This pull requests updates the wikidata script. Changes include:

• Using mediawiki API for calls to wikidata where possible rather than jquery ajax calls
• using OOUI widgets for the main interface rather than custom HTML. This should allow theming to occur automatically. This does not include the results pane.
• reorganising the code layout of the script to make it easier to read

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.22%. Comparing base (693e72f) to head (5118660).
Report is 14 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   90.22%   90.22%           
=======================================
  Files           6        6           
  Lines         972      972           
=======================================
  Hits          877      877           
  Misses         95       95           

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