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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Remove deprecated Error constructor

And use this chance to provide accurate position information for
namespace errors.

Rename Stmt\DeclareDeclare to DeclareItem

Rename Scalar\LNumber to Scalar\Int_

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node constructors still accepts strings and will implicitly create
an Identifier wrapper. Identifier implement __toString(), so that
outside of strict-mode many things continue to work without changes.

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Perform automated test update

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the assoc

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the associated error range has been improved using the new
end attribute stack.

To achieve this the error handling code has been moved out of the
node constructors and into special methods in the parser.

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Don't distinguish test-fail / test

With error recovery this is fluid. Using .test for everything.