PauseManager moved to Shared (#3288)

* Namespace changes for moving IPauseManager to shared.

* Namespace changes for moving ITimerManager from Timers to Timing.

* Rebase Fixes.

* Update engine submodule to v0.3.8

Content.Server/Commands/GameTicking/MappingCommand.cs

@@ -4,11 +4,11 @@ using System.Linq;
 using Content.Server.Administration;
 using Content.Shared.Administration;
 using Robust.Server.Player;
-using Robust.Server.Timing;
 using Robust.Shared.Console;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
+using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
 namespace Content.Server.Commands.GameTicking