Fix some stuff for later use

src/de/steamwar/command/SWCommand.java

@@ -39,21 +39,24 @@ public class SWCommand extends AbstractSWCommand<CommandSender> {
         TypeUtils.init();
     }
 
+    private String permission;
     private Command command;
 
     private List<String> defaultHelpMessages = new ArrayList<>();
 
-    protected SWCommand(String command) {
+    protected SWCommand(String command, String permission) {
         super(CommandSender.class, command);
+        this.permission = permission;
     }
 
-    protected SWCommand(String command, String... aliases) {
+    protected SWCommand(String command, String permission, String... aliases) {
         super(CommandSender.class, command, aliases);
+        this.permission = permission;
     }
 
     @Override
     protected void createAndSafeCommand(String command, String[] aliases) {
-        this.command = new TabCompletableCommand(command, aliases) {
+        this.command = new TabCompletableCommand(command, permission, aliases) {
             @Override
             public void execute(CommandSender commandSender, String[] strings) {
                 SWCommand.this.execute(commandSender, null, strings);
@@ -67,8 +70,8 @@ public class SWCommand extends AbstractSWCommand<CommandSender> {
     }
 
     private abstract static class TabCompletableCommand extends Command implements TabExecutor {
-        public TabCompletableCommand(String name, String... aliases) {
-            super(name, null, aliases);
+        public TabCompletableCommand(String name, String permission, String... aliases) {
+            super(name, permission, aliases);
         }
     }