Introduce Stmt\Block

Stmt\Block will be created for { $a; } style blocks, unless these
occur directly inside some structure that is usually combined
with a block.

For exampl

Introduce Stmt\Block

Stmt\Block will be created for { $a; } style blocks, unless these
occur directly inside some structure that is usually combined
with a block.

For example if ($a) { $b; } will continue to use the old
representation (plain array in in If_::$stmts), but a free-standing
{ $b; } will become a Stmt\Block.

Fixes #590.

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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.

Improve ParserFactory version targeting

Most users will want to pick createForNewestSupportedVersion()
or getForHostVersion(). The currently default is the former,
which can lead to

Improve ParserFactory version targeting

Most users will want to pick createForNewestSupportedVersion()
or getForHostVersion(). The currently default is the former,
which can lead to unwanted surprised due to PHP BC breaks for
users that actually want the latter. Make this choice more
explicit.

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