Commands now have the ability to set a permission required before execution

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/command/PluginCommand.java

@@ -31,6 +31,10 @@ public final class PluginCommand extends Command {
             return false;
         }
 
+        if (!testPermission(sender)) {
+            return true;
+        }
+
         try {
             success = executor.onCommand(sender, this, commandLabel, args);
         } catch (Throwable ex) {