Power Rework (#863)

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Shared/GameObjects/Components/Power/SharedApc.cs

@@ -0,0 +1,65 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components.UserInterface;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Power
+{
+    [Serializable, NetSerializable]
+    public enum ApcVisuals
+    {
+        ChargeState
+    }
+
+    [Serializable, NetSerializable]
+    public enum ApcChargeState
+    {
+        /// <summary>
+        ///     APC does not have enough power to charge cell (if necessary) and keep powering the area.
+        /// </summary>
+        Lack,
+
+        /// <summary>
+        ///     APC is not full but has enough power.
+        /// </summary>
+        Charging,
+
+        /// <summary>
+        ///     APC battery is full and has enough power.
+        /// </summary>
+        Full,
+    }
+
+    [Serializable, NetSerializable]
+    public sealed class ApcBoundInterfaceState : BoundUserInterfaceState
+    {
+        public readonly bool MainBreaker;
+        public readonly ApcExternalPowerState ApcExternalPower;
+        public readonly float Charge;
+
+        public ApcBoundInterfaceState(bool mainBreaker, ApcExternalPowerState apcExternalPower, float charge)
+        {
+            MainBreaker = mainBreaker;
+            ApcExternalPower = apcExternalPower;
+            Charge = charge;
+        }
+    }
+
+    [Serializable, NetSerializable]
+    public sealed class ApcToggleMainBreakerMessage : BoundUserInterfaceMessage
+    { 
+    }
+
+    public enum ApcExternalPowerState
+    {
+        None,
+        Low,
+        Good,
+    }
+
+    [NetSerializable, Serializable]
+    public enum ApcUiKey
+    {
+        Key,
+    }
+}