Add option to set platform string

- for internal use by Smartsupp plugins

src/Smartsupp/ChatGenerator.php

@@ -131,11 +131,26 @@ class ChatGenerator
      */
     protected $hide_widget = false;
 
+    /**
+     * @var null|string plugin platform
+     */
+    protected $platform = null;
+
     public function __construct($key = null)
     {
         $this->key = $key;
     }
 
+    /**
+     * Set platform - serves as internal information for Smartsupp to identify which CMS and version is used.
+     *
+     * @param string $platform
+     */
+    public function setPlatform($platform)
+    {
+        $this->platform = $platform;
+    }
+
     /**
      * Set chat language. Also is checking if language is one of allowed values.
      *
@@ -387,6 +402,10 @@ public function render($print_out = false)
             $params[] = "_smartsupp.offsetY = " . (int)$this->offset_y . ";    // offset from top, default 100";
         }
 
+        if ($this->platform) {
+            $params[] = "_smartsupp.sitePlatform = " . self::javascriptEscape($this->platform) . ";";
+        }
+
         // set detailed visitor's info
         // basic info
         if ($this->email) {