Re-organize all projects (#4166)

Content.Shared/PowerCell/SharedPowerCell.cs

@@ -0,0 +1,17 @@
+#nullable enable
+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.PowerCell
+{
+    public static class SharedPowerCell
+    {
+        public const int PowerCellVisualsLevels = 4;
+    }
+
+    [Serializable, NetSerializable]
+    public enum PowerCellVisuals
+    {
+        ChargeLevel
+    }
+}