Analyze constructor assignments to determine types of class variables more accurately #15

Example case that currently isn't handled optimally ($this->deliveries doesn't get assigned the type ArrayCollection):

class Invoice
{
    /**
     * @var Delivery[]
     */
    private $deliveries;

    public function __construct(iterable $deliveries) {
        $this->deliveries = new ArrayCollection();

        foreach ($deliveries as $delivery) {
            $this->deliveries[] = $delivery;
        }
    }
}

Example case that currently isn't handled optimally ($this->deliveries doesn't get assigned the type ArrayCollection): ```php class Invoice { /** * @var Delivery[] */ private $deliveries; public function __construct(iterable $deliveries) { $this->deliveries = new ArrayCollection(); foreach ($deliveries as $delivery) { $this->deliveries[] = $delivery; } } } ```

Implemented for currently edited buffers in 68c826243c .

Implemented for currently edited buffers in https://git.snorba.art/hugo/phpinspect.el/commit/68c826243c1c358a24e82df1fef148671b6c40fe .

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Analyze constructor assignments to determine types of class variables more accurately #15