Backport 726 to 4.5

[phil-davis]

Backport #726 to the 4.5 branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.65%. Comparing base (d869496) to head (fa40f15).
⚠️ Report is 1 commits behind head on 4.5.

Additional details and impacted files

@@            Coverage Diff            @@
##                4.5     #738   +/-   ##
=========================================
  Coverage     98.65%   98.65%           
+ Complexity     1931     1893   -38     
=========================================
  Files            71       71           
  Lines          5296     5296           
=========================================
  Hits           5225     5225           
  Misses           71       71           

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[phil-davis]

For ancient PHP 7.1 and 7.2 php-cs-fixer reports:

Files that were not fixed due to errors reported during linting before fixing:
   1) /home/runner/work/vobject/vobject/tests/VObject/Component/VAvailabilityTest.php
   2) /home/runner/work/vobject/vobject/tests/VObject/Parser/XmlTest.php

The positioning of the comma directly after the "XML" end of section seems to not be valid.
I will remove that 2nd commit which is only code formatting.