Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invali

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invalid programs.

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Add some missing property types

Add missing parameter types

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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[CS] New line in the end of file

Add strict_types to lib code

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

Change BuilderAbstract into BuilderHelpers static class

Used as poor man's function namespace here.

Cleanup imports

Thanks PhpStorm :)

Extract common builder methods to abstract classes

Declaration for fns/classes in general and FunctionLike for
functions/methods in particular.