re-added --start-time (-s) to .race, updated libraries, version upped to 2.6.0, added 'options' field to help if command has extra options (only .race atm)

NadekoBot.Core/Common/Attributes/NadekoOptions.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NadekoBot.Common.Attributes
+{
+    public class NadekoOptions : Attribute
+    {
+        public Type OptionType { get; set; }
+
+        public NadekoOptions(Type t)
+        {
+            this.OptionType = t;
+        }
+    }
+}