Console Unify API Changes (#3059)

* Remove unused IChatCommand.

* Lots of refactoring into a shared context.

* Removed ICommonSession from server concmd Execute.

* Added argStr parameter to concmd execute.

* The execute function of client concmds now returns void, use the new shell.RemoteExecuteCommand function to forward commands.

* Finally move shells and commands into shared.

* Console commands can now be registered directly without a class in a shared context.

* Engine API Changes.

* Repair rebase damage.

* Update Submodule.

Content.Server/Administration/AdminCommandAttribute.cs

@@ -1,7 +1,7 @@
 using System;
 using Content.Shared.Administration;
 using JetBrains.Annotations;
-using Robust.Server.Interfaces.Console;
+using Robust.Shared.Console;
 
 namespace Content.Server.Administration
 {
@@ -13,7 +13,7 @@ namespace Content.Server.Administration
     /// </remarks>
     /// <seealso cref="AnyCommandAttribute"/>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
-    [BaseTypeRequired(typeof(IClientCommand))]
+    [BaseTypeRequired(typeof(IConsoleCommand))]
     [MeansImplicitUse]
     public sealed class AdminCommandAttribute : Attribute
     {