Disable table locking until Orange 3.31

[janezd]

Issue

Until biolab/orange3#5381 is released, add-ons can neither support unlocking (because released versions do not support it) nor pass the test (because latest version requires unlocking). Thus add-ons will have to disable locking at first, and use unlocking when available-

Description of changes

Disable Table.LOCKING.

Includes

• Code changes
• Tests

[codecov-commenter]

Codecov Report

Merging #126 (6b98fb5) into master (4022308) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #126   +/-   ##
=======================================
  Coverage   82.91%   82.91%           
=======================================
  Files          17       17           
  Lines        3014     3014           
  Branches      352      352           
=======================================
  Hits         2499     2499           
  Misses        461      461           
  Partials       54       54           

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