Add SWCommand.Register.description to simplify help commands

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

@@ -47,6 +47,7 @@ public abstract class SWCommand {
 
     @Setter
     private Message message = null;
+    private List<String> defaultHelpMessages = new ArrayList<>();
 
     protected SWCommand(String command) {
         this(command, new String[0]);
@@ -205,6 +206,10 @@ public abstract class SWCommand {
         });
     }
 
+    public void addDefaultHelpMessage(String message) {
+        defaultHelpMessages.add(message);
+    }
+
     private List<Method> methods() {
         List<Method> methods = new ArrayList<>(Arrays.asList(getClass().getDeclaredMethods()));
         methods.addAll(Arrays.asList(SWCommand.class.getDeclaredMethods()));
@@ -228,6 +233,7 @@ public abstract class SWCommand {
         }
         try {
             message.sendPrefixless("COMMAND_HELP_HEAD", p, command.getName());
+            defaultHelpMessages.forEach(s -> message.sendPrefixless(s, p));
         } catch (Exception e) {
             Bukkit.getLogger().log(Level.WARNING, "Failed to send help message", e);
             return;