Allow bitcoin scheme to URLs

classes/File_redirection.php

@@ -312,6 +312,7 @@ class File_redirection extends Managed_DataObject
                 $out_url = str_replace('.-()', '', $out_url);
                 break;
 
+            case 'bitcoin':
             case 'mailto':
             case 'magnet':
             case 'aim':

lib/util.php

@@ -885,7 +885,7 @@ function common_replace_urls_callback($text, $callback, $arg = null) {
                 '(?:'.
                     '(?:(?:https?|ftps?|mms|rtsp|gopher|news|nntp|telnet|wais|file|prospero|webcal|ircs?)://)'.
                     '|'.
-                    '(?:(?:mailto|aim|tel|xmpp):)'.
+                    '(?:(?:bitcoin|mailto|aim|tel|xmpp):)'.
                 ')'.
                 '(?:[\pN\pL\-\_\+\%\~]+(?::[\pN\pL\-\_\+\%\~]+)?\@)?'. //user:pass@
                 '(?:'.