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.Shared/Access/Components/AccessReaderComponent.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Shared.Access.Components
+{
+    /// <summary>
+    ///     Stores access levels necessary to "use" an entity
+    ///     and allows checking if something or somebody is authorized with these access levels.
+    /// </summary>
+    [RegisterComponent]
+    public class AccessReaderComponent : Component
+    {
+        public override string Name => "AccessReader";
+
+        /// <summary>
+        ///     Whether this reader is enabled or not. If disabled, all access
+        ///     checks will pass.
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public bool Enabled = true;
+
+        /// <summary>
+        ///     The set of tags that will automatically deny an allowed check, if any of them are present.
+        /// </summary>
+        public HashSet<string> DenyTags = new();
+
+        /// <summary>
+        ///     List of access lists to check allowed against. For an access check to pass
+        ///     there has to be an access list that is a subset of the access in the checking list.
+        /// </summary>
+        [DataField("access")]
+        [ViewVariables]
+        public List<HashSet<string>> AccessLists = new();
+    }
+}