Support additional file name and path characters in media manager (#4564)

* Support additional file name and path characters in media manager

When working with abstract file names that may contain additional characters, such as quotes or ampersands, the media manager would throw an error. This PR adds two additional characters to the character whitelist.

* Add unicode filename to tests

modules/system/classes/MediaLibrary.php

@@ -486,6 +486,8 @@ class MediaLibrary
             preg_quote(']', '/'),
             preg_quote(',', '/'),
             preg_quote('=', '/'),
+            preg_quote("'", '/'),
+            preg_quote('&', '/'),
         ];
 
         if (!preg_match('/^[' . implode('', $regexWhitelist) . ']+$/iu', $path)) {

tests/unit/system/classes/MediaLibraryTest.php

@@ -37,6 +37,11 @@ class MediaLibraryTest extends TestCase // @codingStandardsIgnoreLine
             ['one(two)[].ext'],
             ['one=(two)[].ext'],
             ['one_(two)[].ext'],
+            /*
+            Example of a unicode-based filename with a single quote
+            @see: https://github.com/octobercms/october/pull/4564
+            */
+            ['BG中国通讯期刊(Blend\'r)创刊号.pdf'],
         ];
     }