Add slime world support for per player worlds

Move package to dev.plex.extras to prevent any possible conflicts with main plugin

src/main/java/dev/plex/extras/command/EjectCommand.java

@@ -0,0 +1,26 @@
+package dev.plex.extras.command;
+
+import dev.plex.command.PlexCommand;
+import dev.plex.command.annotation.CommandParameters;
+import dev.plex.command.annotation.CommandPermissions;
+import dev.plex.command.source.RequiredCommandSource;
+import dev.plex.rank.enums.Rank;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+@CommandParameters(name = "eject", description = "Removes all passengers from a player")
+@CommandPermissions(level = Rank.OP, permission = "plex.tfmextras.eject", source = RequiredCommandSource.IN_GAME)
+public class EjectCommand extends PlexCommand
+{
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player player, @NotNull String[] args)
+    {
+        final int passengers = player.getPassengers().size();
+        player.eject();
+        return MiniMessage.miniMessage().deserialize("<gray>Ejected " + passengers + " passengers.");
+    }
+}