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.

Rename Scalar\LNumber to Scalar\Int_

Remove PHP 5 parser

Add named argument support

Not adding any explicit FPPP support, as I don't think add/remove
of names can be handled any better than full reformatting.