consistent class naming

ext/rss_images/info.php

@@ -7,7 +7,7 @@
  * License: GPLv2
  * Description: Self explanatory
  */
-class RSS_ImagesInfo extends ExtensionInfo
+class RSSImagesInfo extends ExtensionInfo
 {
     public const KEY = "rss_images";
 

ext/rss_images/main.php

@@ -1,7 +1,7 @@
 <?php
 
 
-class RSS_Images extends Extension
+class RSSImages extends Extension
 {
     public function onPostListBuilding(PostListBuildingEvent $event)
     {

ext/rss_images/theme.php

@@ -1,5 +1,5 @@
 <?php
 /* needed for access to build_thumb_html */
-class RSS_ImagesTheme extends Themelet
+class RSSImagesTheme extends Themelet
 {
 }