Fixes #621: Font::uchr: allow int|float for $code parameter #487

Job	Run time
PHPUnit (PHP 7.1)	23s
PHPUnit (PHP 7.2)	30s
PHPUnit (PHP 7.3)	19s
PHPUnit (PHP 7.4)	25s
PHPUnit (PHP 8.0)	19s
PHPUnit (PHP 8.1)	22s
PHPUnit (PHP 8.2)	23s
Tests alternative autoloader (PHP 7.1)	11s
Tests alternative autoloader (PHP 7.2)	11s
Tests alternative autoloader (PHP 7.3)	8s
Tests alternative autoloader (PHP 7.4)	11s
Tests alternative autoloader (PHP 8.0)	10s
Tests alternative autoloader (PHP 8.1)	9s
Tests alternative autoloader (PHP 8.2)	10s
PHPUnit Composer v2 (PHP 7.4)	28s
PHPUnit coverage (PHP 7.4)	46s
PHPUnit lowest deps (PHP 7.3)	24s
Windows-Tests with PHP 7.1	59s
Windows-Tests with PHP 7.2	50s
Windows-Tests with PHP 7.3	43s
Windows-Tests with PHP 7.4	49s
Windows-Tests with PHP 8.0	58s
Windows-Tests with PHP 8.1	56s
Windows-Tests with PHP 8.2	53s
	11m 37s

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