remove deprecated laminas json (#4)

* remove deprecated laminas json

* Update TooltipTest.php

* Update ExportingTest.php

* Update AbstractChart.php

* Create Json.php

Author: 94noni

Highcharts/AbstractChart.php

@@ -2,8 +2,6 @@
 
 namespace Ob\HighchartsBundle\Highcharts;
 
-use Laminas\Json\Json;
-
 abstract class AbstractChart
 {
     // Default options
@@ -111,7 +109,7 @@ protected function renderArrayWithCallback($chartOption, $name)
         $result = "";
 
         if (!empty($chartOption)) {
-            // Zend\Json is used in place of json_encode to preserve JS anonymous functions
+            // Json is used in place of json_encode to preserve JS anonymous functions
             $result .= $name . ": " . Json::encode($chartOption[0], false, array('enableJsonExprFinder' => true)) . ", \n";
         }
 
@@ -129,7 +127,7 @@ protected function renderObjectWithCallback($chartOption, $name)
         $result = "";
 
         if (get_object_vars($chartOption)) {
-            // Zend\Json is used in place of json_encode to preserve JS anonymous functions
+            // Json is used in place of json_encode to preserve JS anonymous functions
             $result .= $name . ": " . Json::encode($chartOption, false, array('enableJsonExprFinder' => true)) . ",\n";
         }