Highlightable attachment paths

[Treeed]

When editing a part there is no way to highlight an attachment path in order to copy it. There is also no way to edit it without completely removing it, even if it has just been entered.
Another nuisance is that when entering a path that has been in that field before, that text is lost when clicking outside the field.

I wrote two small Tom Select plugins to fix that.

click_to_edit would probably also be nice to have in any other Tom Select fields that allow creating options and autoselect_typed would probably be nice to have in any other Tom Select fields in general.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.83%. Comparing base (d093721) to head (4820763).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #849      +/-   ##
============================================
- Coverage     60.85%   60.83%   -0.02%     
  Complexity     5931     5931              
============================================
  Files           523      523              
  Lines         20089    20089              
============================================
- Hits          12225    12222       -3     
- Misses         7864     7867       +3     

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