Re-organize all projects (#4166)

Content.Shared/Cabinet/ExtinguisherCabinet.cs

@@ -0,0 +1,13 @@
+#nullable enable
+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Cabinet
+{
+    [Serializable, NetSerializable]
+    public enum ItemCabinetVisuals : byte
+    {
+        IsOpen,
+        ContainsItem
+    }
+}