Move Access & AccessReader to shared. (#5798)

* git mv

* Move Access Component & system.

- Name space changes
- Rename AccessReader to AccessReaderComponent
- Also need an abstract TryGetSlot function for SharedInventoryComponent

* better TryGetSlot

* Ah yes, tests exist.

Content.Server/Singularity/Components/EmitterComponent.cs

@@ -1,9 +1,8 @@
 using System;
 using System.Threading;
-using Content.Server.Access.Components;
 using Content.Server.Power.Components;
+using Content.Shared.Access.Components;
 using Content.Shared.Sound;
-using Robust.Server.GameObjects;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.ViewVariables;
@@ -15,7 +14,7 @@ namespace Content.Server.Singularity.Components
     public class EmitterComponent : Component
     {
         [ComponentDependency] public readonly AppearanceComponent? Appearance = default;
-        [ComponentDependency] public readonly AccessReader? AccessReader = default;
+        [ComponentDependency] public readonly AccessReaderComponent? AccessReader = default;
         [ComponentDependency] public readonly PowerConsumerComponent? PowerConsumer = default;
 
         public override string Name => "Emitter";