Move webhook to project notification type

app/Schema/Sqlite.php

@@ -6,7 +6,20 @@ use Kanboard\Core\Security;
 use PDO;
 use Kanboard\Model\Link;
 
-const VERSION = 86;
+const VERSION = 87;
+
+function version_87($pdo)
+{
+    $pdo->exec("
+        CREATE TABLE project_has_notification_types (
+            id INTEGER PRIMARY KEY,
+            project_id INTEGER NOT NULL,
+            notification_type TEXT,
+            FOREIGN KEY(project_id) REFERENCES projects(id) ON DELETE CASCADE,
+            UNIQUE(project_id, notification_type)
+        )
+    ");
+}
 
 function version_86($pdo)
 {