Support for ServerListPlus #55
Description
In the current dev build of ServerListPlus PlaceholderAPI placeholders can be used. Since about 130,000 admins use this plugin for their MOTD, I propose to delete the MotdManager completely and then explain the procedure in the wiki. (We have already implemented the generation of PAPI-supported placeholders.) ServerListPlus has been perfect for MOTD configurations for years and has many good features. If I leave the status configurable and then make it a PAPI placeholder "status", it is super to include in ServerListPlus. Of course, only when the PAPI support is in an official build of SLP in the future.
Our current motd manager is very limited. Outsourcing to ServerListPlus has more advantages for the admins as well.