Allow command nodes to be separated by a configurable string

Resolves #304

src/Discord.Net.Commands/CommandService.cs

@@ -20,6 +20,7 @@ namespace Discord.Commands
         private readonly CommandMap _map;
 
         internal readonly RunMode _defaultRunMode;
+        internal readonly string _nodeSeparator;
 
         public IEnumerable<ModuleInfo> Modules => _moduleDefs.Select(x => x);
         public IEnumerable<CommandInfo> Commands => _moduleDefs.SelectMany(x => x.Commands);
@@ -68,6 +69,7 @@ namespace Discord.Commands
                 [typeof(IGuildUser)] = new UserTypeReader<IGuildUser>(),
             };
             _defaultRunMode = config.DefaultRunMode;
+            _nodeSeparator = config.NodeSeparator;
         }
 
         //Modules

src/Discord.Net.Commands/CommandServiceConfig.cs

@@ -4,5 +4,7 @@
     {
         /// <summary> The default RunMode commands should have, if one is not specified on the Command attribute or builder. </summary>
         public RunMode DefaultRunMode { get; set; } = RunMode.Mixed;
+        /// <summary> What character should be used between command nodes</summary>
+        public string NodeSeparator { get; set; } = " ";
     }
 }

src/Discord.Net.Commands/Info/CommandInfo.cs

@@ -42,7 +42,6 @@ namespace Discord.Commands
 
             // both command and module provide aliases
             if (module.Aliases.Count > 0 && builder.Aliases.Count > 0)
-                Aliases = module.Aliases.Permutate(builder.Aliases, (first, second) => second != null ? first + " " + second : first).ToImmutableArray();
             // only module provides aliases
             else if (module.Aliases.Count > 0)
                 Aliases = module.Aliases.ToImmutableArray();
@@ -50,6 +49,7 @@ namespace Discord.Commands
             else if (builder.Aliases.Count > 0)
                 Aliases = builder.Aliases.ToImmutableArray();
             // neither provide aliases
+                Aliases = module.Aliases.Permutate(builder.Aliases, (first, second) => second != null ? first + " " + second : first).ToImmutableArray();
             else
                 throw new InvalidOperationException("Cannot build a command without any aliases");