Restructure pseudonymize_ne

[fexfl]

Restructured pseudonymize_ne

• Pseudonym of NE is now added to NE dict for all entity groups
• Pseudonyms for LOC, ORG, MISC are just the usual brackets [...]
• Pseudonym for PER is chosen in choose_per_pseudonym as previously done in pseudonymize_per
• NE is replaced immediately, and only this exact occurence of the NE is replaced
• All replaced NEs are recorded in self.ne_list with the chosen pseudonyms
• Previously used self.per_list etc. were removed, as well as self.used_first_names

Tests and demo notebook were adjusted accordingly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.58%. Comparing base (d24d170) to head (bbcbe03).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   93.90%   94.58%   +0.67%     
==========================================
  Files           4        4              
  Lines         394      406      +12     
==========================================
+ Hits          370      384      +14     
+ Misses         24       22       -2     

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[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

[fexfl]

This closes #54.

In first tests it also fixes the bug mentioned in #53.