Added order:file_size support to post searching

TODO

@@ -15,7 +15,6 @@ everything related to posts:
         - search order
             - order:comment_count
             - order:comment_time
-            - order:file_size
             - order:random (at least unstable version)
 
     - single post view

src/SearchServices/Filters/PostFilter.php

@@ -9,6 +9,7 @@ class PostFilter extends BasicFilter implements IFilter
 	const ORDER_TAG_COUNT = 'tagCount';
 	const ORDER_SCORE = 'score';
 	const ORDER_LAST_EDIT_TIME = 'lastEditTime';
+	const ORDER_FILE_SIZE = 'originalFileSize';
 
 	const REQUIREMENT_TAG = 'tag';
 	const REQUIREMENT_ID = 'id';

src/SearchServices/Parsers/PostSearchParser.php

@@ -94,6 +94,9 @@ class PostSearchParser extends AbstractSearchParser
 		elseif ($token === 'score')
 			return \Szurubooru\SearchServices\Filters\PostFilter::ORDER_SCORE;
 
+		elseif ($token === 'file_size')
+			return \Szurubooru\SearchServices\Filters\PostFilter::ORDER_FILE_SIZE;
+
 		throw new \BadMethodCallException('Not supported');
 	}