Add cache invalidation

SpigotCore_Main/src/de/steamwar/core/Core.java

@@ -22,6 +22,7 @@ package de.steamwar.core;
 import com.comphenix.tinyprotocol.TinyProtocol;
 import de.steamwar.command.SWCommandUtils;
 import de.steamwar.command.SWTypeMapperCreator;
+import de.steamwar.command.TabCompletionCache;
 import de.steamwar.command.TypeMapper;
 import de.steamwar.core.authlib.AuthlibInjector;
 import de.steamwar.core.events.ChattingEvent;
@@ -111,6 +112,7 @@ public class Core extends JavaPlugin{
 				return tabCompleter.apply(sender, s);
 			}
 		});
+		Bukkit.getScheduler().runTaskTimer(this, TabCompletionCache::invalidateOldEntries, 20, 20);
 
 		setSqlConfig();
 		errorHandler = new ErrorHandler();