Filter list can be badly splitted when calling the macro GitLab macro

The current GitLab macro contains the following code for splitting the macro content and defining multiple fields that should create restrictions.

      def issueFilterList = xcontext.macro.content.split('\r\n');

However, it turns out that the WYSIWYG editor could also generate \n for creating carriage returns instead of \r\n, thus breaking the macros.