Re-add qlink helper unless we find a better name

* I stumbled over too many places where we didn't care about quoting
  or escaping output, attributes etc
* Helpers help here

application/views/helpers/Qlink.php

@@ -0,0 +1,89 @@
+<?php
+
+// TODO: Search for the best and safest quoting
+// TODO: Check whether attributes are safe. Script, title in combination with
+//       Hover-Tips etc. Eventually create a whitelist for a few options only.
+use Icinga\Web\Url;
+
+class Zend_View_Helper_Qlink extends Zend_View_Helper_Abstract
+{
+
+    public function qlink($htmlContent, $urlFormat, array $uriParams = array(),
+        array $properties = array())
+    {
+        $quote = true;
+        $attributes = array();
+        $baseUrl = null;
+        foreach ($properties as $key => $val) {
+            if ($key === 'baseUrl' ) {
+                // $baseUrl = filter_var($val, FILTER_SANITIZE_URL) . '/';
+                $baseUrl = $val; //rawurlencode($val) . '/';
+                continue;
+            }
+            if ($key === 'quote') {
+                $quote = $val;
+                continue;
+            }
+            if ($key === 'style' && is_array($val)) {
+                if (empty($val)) {
+                    continue;
+                }
+                $parts = array();
+                foreach ($val as $k => $v) {
+                    $parts[] = "$k: $v";
+                }
+                $attributes[] = 'style="' . implode('; ', $parts) . '"';
+                continue;
+            }
+            $attributes[] = sprintf(
+                '%s="%s"',
+                //filter_var($key, FILTER_SANITIZE_URL),
+                rawurlencode($key),
+                //filter_var($val, FILTER_SANITIZE_FULL_SPECIAL_CHARS)
+                rawurlencode($val)
+            );
+
+        }
+        if ($urlFormat instanceof Url) {
+            $url = $urlFormat;
+            $uriParams = $url->getParams() + $uriParams;
+        } else {
+            $url = Url::fromPath($urlFormat);
+        }
+        $url->setParams($uriParams)->setBaseUrl($baseUrl);
+        return sprintf(
+            '<a href="%s"%s>%s</a>',
+//            $this->getFormattedUrl($urlFormat, $uriParams, $baseUrl),
+            $url,
+            !empty($attributes) ? ' ' . implode(' ', $attributes) : '',
+            $quote
+          ? filter_var(
+                $htmlContent,
+                FILTER_SANITIZE_FULL_SPECIAL_CHARS,
+                FILTER_FLAG_NO_ENCODE_QUOTES
+            )
+            // Alternativ: htmlentities($htmlContent)
+          : $htmlContent
+        );
+    }
+/*
+    public function getFormattedUrl($urlFormat, $uriParams, $baseUrl = null)
+    {
+        $params = $args = array();
+        foreach ($uriParams as $name => $value) {
+            if (is_int($name)) {
+                $params[] = rawurlencode($value);
+            } else {
+                $args[] = rawurlencode($name) . '=' . rawurlencode($value);
+            }
+        }
+        $url = $urlFormat;
+        $url = vsprintf($url, $params);
+        if (! empty($args)) {
+            $url .= '?' . implode('&amp;', $args);
+        }
+        return is_null($baseUrl) ? $this->view->baseUrl($url) : $baseUrl.$url;
+    }
+*/
+}
+