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/GameTicking/GameTicker.Spawning.cs

@@ -2,7 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
-using Content.Server.Access.Components;
 using Content.Server.Access.Systems;
 using Content.Server.Ghost;
 using Content.Server.Ghost.Components;
@@ -15,6 +14,7 @@ using Content.Server.Roles;
 using Content.Server.Spawners.Components;
 using Content.Server.Speech.Components;
 using Content.Server.Station;
+using Content.Shared.Access.Components;
 using Content.Shared.Administration.Logs;
 using Content.Shared.CharacterAppearance.Systems;
 using Content.Shared.Database;