[ENH] Mark "Words" outputs as non-dynamic

[ales-erjavec]

Issue

Ref: biolab/orange-canvas-core#230

Description of changes

Mark "Words" outputs as non-dynamic
They are always a Table and not a subtype. This improves auto connection hinting since it never makes sense to connect them to Corpus inputs.

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.66%. Comparing base (4c38b3f) to head (4011c9c).
⚠️ Report is 455 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #855      +/-   ##
==========================================
- Coverage   76.67%   76.66%   -0.02%     
==========================================
  Files          83       83              
  Lines       11761    11761              
  Branches     1867     1867              
==========================================
- Hits         9018     9016       -2     
- Misses       2439     2440       +1     
- Partials      304      305       +1     

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