Adopt SSP coding-style #270

Job	Run time
PHP-Linter (8.3) / linter	12s
PHP-Linter (8.2) / linter	16s
PHP-Linter (8.4) / linter	17s
Linter / json-linter	27s
Linter / yaml-linter	5s
PHP-Linter (8.5) / linter	9s
Linter / ecmascript-linter	-1s
Linter / style-linter	-1s
Unit tests, PHP 8.3, ubuntu-latest	27s
Unit tests, PHP 8.2, windows-latest	1m 25s
Unit tests, PHP 8.5, ubuntu-latest	27s
Unit tests, PHP 8.4, ubuntu-latest	26s
Unit tests, PHP 8.2, ubuntu-latest	26s
Unit tests, PHP 8.5, windows-latest	59s
Unit tests, PHP 8.4, windows-latest	1m 53s
Unit tests, PHP 8.3, windows-latest	1m 0s
Quality control	33s
Security checks	19s
Code coverage	9s
Cleanup artifacts	4s
	9m 32s

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