Add IgnoreOriginRule-related entities, db migration, update config

Add IgnoreOriginUserRule for user-defined rules and
IgnoreOriginInstanceRule for system-wide rules. Add an interface for
these two new entities.

Signed-off-by: Kevin Decherf <kevin@kdecherf.com>

src/Wallabag/CoreBundle/Entity/IgnoreOriginInstanceRule.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Wallabag\CoreBundle\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\RulerZ\Validator\Constraints as RulerZAssert;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * Ignore Origin rule.
+ *
+ * @ORM\Entity(repositoryClass="Wallabag\CoreBundle\Repository\IgnoreOriginInstanceRuleRepository")
+ * @ORM\Table(name="`ignore_origin_instance_rule`")
+ * @ORM\Entity
+ */
+class IgnoreOriginInstanceRule implements IgnoreOriginRuleInterface, RuleInterface
+{
+    /**
+     * @var int
+     *
+     * @ORM\Column(name="id", type="integer")
+     * @ORM\Id
+     * @ORM\GeneratedValue(strategy="AUTO")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @Assert\NotBlank()
+     * @Assert\Length(max=255)
+     * @RulerZAssert\ValidRule(
+     *  allowed_variables={"host","pattern"},
+     *  allowed_operators={"=","~"}
+     * )
+     * @ORM\Column(name="rule", type="string", nullable=false)
+     */
+    private $rule;
+
+    /**
+     * Get id.
+     *
+     * @return int
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Set rule.
+     *
+     * @return IgnoreOriginRuleInterface
+     */
+    public function setRule(string $rule)
+    {
+        $this->rule = $rule;
+
+        return $this;
+    }
+
+    /**
+     * Get rule.
+     *
+     * @return string
+     */
+    public function getRule()
+    {
+        return $this->rule;
+    }
+}