Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this

Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this
representation measurably improves memory usage and performance.

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Add newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Remove PHP 5 parser

Add constructor promotion support

[PHP 8.0] Add exception witout variable