Initial split of the modules

NadekoBot.Core/Common/Attributes/OwnerOnlyAttribute.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Threading.Tasks;
+using Discord.Commands;
+using NadekoBot.Services;
+
+namespace NadekoBot.Common.Attributes
+{
+    public class OwnerOnlyAttribute : PreconditionAttribute
+    {
+        public override Task<PreconditionResult> CheckPermissions(ICommandContext context, CommandInfo executingCommand, IServiceProvider services)
+        {
+            var creds = (IBotCredentials)services.GetService(typeof(IBotCredentials));
+
+            return Task.FromResult((creds.IsOwner(context.User) || context.Client.CurrentUser.Id == context.User.Id ? PreconditionResult.FromSuccess() : PreconditionResult.FromError("Not owner")));
+        }
+    }
+}