refactored the welcome plugin to use a web api instead of a hard coded file

removed deprecated file class
don't wait for response when setting dvar/sending command in T6
potential fix for duplicate kick message in JS plugin

Application/Server.cs

@@ -966,7 +966,6 @@ namespace IW4MAdmin
                 Offender = Target,
                 Offense = Reason,
                 Punisher = Origin,
-                Active = true,
                 When = DateTime.UtcNow,
                 Link = Target.AliasLink
             };