Use addWarning on warnings, silenced errors, notices (#1767)

* Use `addWarning` on warnings, silenced errors, notices

* shorter

Author: erikn69

src/LaravelDebugbar.php

@@ -662,7 +662,10 @@ public function addCollector(DataCollectorInterface $collector)
      */
     public function handleError($level, $message, $file = '', $line = 0, $context = [])
     {
-        $this->addThrowable(new \ErrorException($message, 0, $level, $file, $line));
+        if ($this->hasCollector('exceptions')) {
+            $this['exceptions']->addWarning($level, $message, $file, $line);
+        }
+
         if ($this->hasCollector('messages')) {
             $file = $file ? ' on ' . $this['messages']->normalizeFilePath($file) . ":{$line}" : '';
             $this['messages']->addMessage($message . $file, 'deprecation');