Sort button for related contents

[didoda]

This introduces a "sort" section to sort by title (asc or desc) related contents for a specific object and relation.

Feature is available if BEdita API is at least 5.31.0 (waiting for bedita/bedita#2102 to be merged, to have release 5.31.0).

Sort fields can be configured per relation by RelationsSortFields config. An example follows:

    /**
     * Relations sort fields.
     * Define sortable fields per relation.
     */
    'RelationsSortFields' => [
        'composed_by' => [
            ['label' => 'Short title', 'value' => 'short_title'],
            ['label' => 'Title', 'value' => 'title'],
        ],
        'composed_by_default' => 'short_title',
        'part_of' => [
            ['label' => 'Short title', 'value' => 'short_title'],
            ['label' => 'Title', 'value' => 'title'],
        ],
        'part_of_default' => 'short_title',
    ],

On "save" click, a modal confirm pops up: you can decide if continue or skip.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.70%. Comparing base (669fbff) to head (7b398c4).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1191   +/-   ##
=========================================
  Coverage     99.70%   99.70%           
- Complexity     1310     1312    +2     
=========================================
  Files            97       97           
  Lines          5113     5117    +4     
=========================================
+ Hits           5098     5102    +4     
  Misses           15       15           

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[manuelzane]

I would only change the labels to something more explicit, like this: