Redirected click to use hook

[th-jyu]

Opens up option for developers to add their own behaviours when their artists click on the items in the publish tree widget. For example, extending to:

• Make double clicks select all tasks from the same plugin name
• Alt-click toggles check state

These are possible since the new methods (explicitly) pass on:

• TreeNode* clicked, as well as it's widget
• Any api.Publish* instance associated with it
• The QMouseButtons and QKeyboardModifiers used during the click

Added

• New tree_node_clicked hook with single() and double() methods

Changed

• Redirects calls to double_clicked() to new tree_node_clicked hook's double() method

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.30%. Comparing base (0e27293) to head (1bdf924).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
+ Coverage   40.18%   40.30%   +0.12%     
==========================================
  Files          61       61              
  Lines        5027     5034       +7     
==========================================
+ Hits         2020     2029       +9     
+ Misses       3007     3005       -2     

Flag	Coverage Δ
Linux	40.30% <100.00%> (+0.12%)	⬆️
Python-3.10	40.30% <100.00%> (+0.12%)	⬆️
Python-3.11	40.30% <100.00%> (+0.12%)	⬆️
Python-3.13	40.30% <100.00%> (+0.12%)	⬆️
Python-3.9	40.31% <100.00%> (+0.12%)	⬆️
Windows	40.30% <100.00%> (+0.12%)	⬆️
macOS	40.30% <100.00%> (+0.12%)	⬆️

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