Rename Scalar\LNumber to Scalar\Int_

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired st

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired style, which is PSR-12, but with sane brace placement.

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Add visibility modifiers to constants

Closes GH-848.

[LNumber] Add rawValue attribute to LNumber to allow numeric separator etc. (#832)

Add support for explicit octal literals

[PHP 7.4] Add support for numeric literal separators (#615)

Implements RFC https://wiki.php.net/rfc/numeric_literal_separator.

Closes #614.

Avoid parent constructor call during node construction

Instead explicitly assign the attributes. This is a minor
performance improvement.

Add public visibility to getType method (#463)

Add explicit getType() methods

Rather than automatically deriving getType() from the class name.

Add strict_types to lib code

[cs] use PHP 5.4 short array, since PHP 7.0 is min version

Generate PHP 7 type annotations

Forbid invalid octals in PHP 7 mode

Remove internal LNumber::parse() method

Combine it into ::fromString(), as they both do the same checks.

Move "kind" attribute handling out of lexer

Doesn't belong there and will cause issue with multiple assignments.

Add "kind" attribute to LNumbers

Kind specifies whether the number was formatted as decimal, octal,
binary or hex. The pretty printer reproduces the number kind (but
not necessarily

Add "kind" attribute to LNumbers

Kind specifies whether the number was formatted as decimal, octal,
binary or hex. The pretty printer reproduces the number kind (but
not necessarily the exact formatting).

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Drop default values from Scalar ctor params

Drop support for old Node format

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, ass

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, assigning them in the constructor, overriding
the getSubNodeNames() method and passing NULL to the first argument
of the NodeAbstract constructor.

[Deprecated: It's still possible to use the old mode of operation
for custom nodes by passing an array of subnodes to the constructor.]

The only behavior difference this should cause is that getSubNodeNames()
will always return the original subnode names and skip any additional
properties that were dynamically added. E.g. this means that the
"namespacedName" node added by the NameResolver visitor is not treated
as a subnode, but as a dynamic property instead.

This change improves performance and memory usage.

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Annotate some APIs as @internal

Port library to use namespaces, with BC for old names