Support metadata element names containing spaces #460

Job	Run time
Tests alternative autoloader (PHP 7.1)	9s
Tests alternative autoloader (PHP 7.2)	9s
Tests alternative autoloader (PHP 7.3)	11s
Tests alternative autoloader (PHP 7.4)	9s
Tests alternative autoloader (PHP 8.0)	9s
Tests alternative autoloader (PHP 8.1)	11s
Tests alternative autoloader (PHP 8.2)	8s
PHPUnit (PHP 7.2)	24s
PHPUnit (PHP 7.3)	19s
PHPUnit (PHP 7.4)	25s
PHPUnit (PHP 8.0)	21s
PHPUnit (PHP 8.1)	22s
PHPUnit (PHP 8.2)	21s
PHPUnit Composer v2 (PHP 7.4)	29s
PHPUnit coverage (PHP 7.4)	48s
PHPUnit (PHP 7.1)	29s
PHPUnit lowest deps (PHP 7.3)	25s
Windows-Tests with PHP 7.1	57s
Windows-Tests with PHP 7.2	54s
Windows-Tests with PHP 7.3	47s
Windows-Tests with PHP 7.4	54s
Windows-Tests with PHP 8.0	51s
Windows-Tests with PHP 8.1	56s
Windows-Tests with PHP 8.2	55s
	11m 43s

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