Fix SWCommand registering on new instance

Add SWCommandUtils long mapper

SpigotCore_Main/src/de/steamwar/command/SWCommand.java

@@ -77,6 +77,7 @@ public abstract class SWCommand {
                 return strings;
             }
         };
+        unregister();
         register();
 
         for (Method method : getClass().getDeclaredMethods()) {

SpigotCore_Main/src/de/steamwar/command/SWCommandUtils.java

@@ -61,6 +61,7 @@ public class SWCommandUtils {
         addMapper(float.class, Float.class, createMapper(numberMapper(Float::parseFloat), numberCompleter(Float::parseFloat)));
         addMapper(double.class, Double.class, createMapper(numberMapper(Double::parseDouble), numberCompleter(Double::parseDouble)));
         addMapper(int.class, Integer.class, createMapper(numberMapper(Integer::parseInt), numberCompleter(Integer::parseInt)));
+        addMapper(long.class, Long.class, createMapper(numberMapper(Long::parseLong), numberCompleter(Long::parseLong)));
         MAPPER_FUNCTIONS.put(String.class.getTypeName(), createMapper(s -> s, Collections::singletonList));
         MAPPER_FUNCTIONS.put(Player.class.getTypeName(), createMapper(Bukkit::getPlayer, s -> Bukkit.getOnlinePlayers().stream().map(Player::getName).collect(Collectors.toList())));
         MAPPER_FUNCTIONS.put(GameMode.class.getTypeName(), createMapper(s -> {