Allow base path parsing in the external_config system setting

Resolves #24

Author: theboxer

core/components/tinymcerte/docs/changelog.txt

@@ -1,5 +1,6 @@
 Changelog for TinyMCE Rich Text Editor.
 
+- Allow base path parsing in the external_config system setting
 - Add tel: prefix
 - Add modximage - left/right image positioning
 - Sync tinymce and textarea

core/components/tinymcerte/model/tinymcerte/events/tinymcerteonrichtexteditorinit.class.php

@@ -90,6 +90,10 @@ private function getTinyConfig() {
 
         $externalConfig = $this->tinymcerte->getOption('external_config');
         if (!empty($externalConfig)) {
+            $externalConfig = str_replace('{base_path}', $this->modx->getOption('base_path'), $externalConfig);
+            $externalConfig = str_replace('{core_path}', $this->modx->getOption('core_path'), $externalConfig);
+            $externalConfig = str_replace('{assets_path}', $this->modx->getOption('assets_path'), $externalConfig);
+            
             if (file_exists($externalConfig) && is_readable($externalConfig)) {
                 $externalConfig = file_get_contents($externalConfig);
                 $externalConfig = $this->modx->fromJSON($externalConfig);