Experiment with clickable regions

[cdrini]

Modernized version of #743 , using our new HTML-based text layer and anchor elements.

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 28 lines in your changes missing coverage. Please review.

Project coverage is 69.51%. Comparing base (2faec53) to head (f8da74f).

Files with missing lines	Patch %	Lines
src/plugins/plugin.text_selection.js	41.66%	27 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1414      +/-   ##
==========================================
- Coverage   69.82%   69.51%   -0.31%     
==========================================
  Files          60       60              
  Lines        5206     5245      +39     
  Branches     1127     1140      +13     
==========================================
+ Hits         3635     3646      +11     
- Misses       1540     1567      +27     
- Partials       31       32       +1     

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