XSD: Add RuleName attribute for <logger>
XSD: Add RuleName attribute for <logger>

304NotModified/NLog,UgurAldanmaz/NLog,BrutalCode/NLog,luigiberrettini/NLog,UgurAldanmaz/NLog,sean-gilliam/NLog,BrutalCode/NLog,luigiberrettini/NLog,snakefoot/NLog,NLog/NLog