Apc device network and apc based light switch (#4908)

* Remove WireNet node group from cables
Implement extension cable components and system
Remove connection over distance logic from ApcPower... components

* Add extension cable components to prototypes

* Implement ApcNetwork
Implement ApcNetSwitch

* Fix ignoredComponents.cs

* Add friend attribute to new components

* Add construction graph for a light switch

* Address reviews

* Fix broken test

* Move ConnectionType enum to DeviceNetworkComponent
Change netId data definition to use the ConnectionType enum values

Co-authored-by: Julian Giebel <j.giebel@netrocks.info>

Content.Server/DeviceNetwork/DeviceNetworkConstants.cs

@@ -1,21 +1,38 @@
 namespace Content.Server.DeviceNetwork
 {
     /// <summary>
-    /// A collection of utilities to help with using device networks
+    /// A collection of constants to help with using device networks
     /// </summary>
     public static class DeviceNetworkConstants
     {
-        public enum ConnectionType
-        {
-            Private,
-            Wired,
-            Wireless
-        }
+        /// <summary>
+        /// Invalid address used for broadcasting
+        /// </summary>
+        public const string NullAddress = "######";
+
+        #region Commands
 
         /// <summary>
         /// The key for command names
         /// E.g. [DeviceNetworkConstants.Command] = "ping"
         /// </summary>
         public const string Command = "command";
+
+        /// <summary>
+        /// The command for setting a devices state
+        /// E.g. to turn a light on or off
+        /// </summary>
+        public const string CmdSetState = "set_state";
+
+        #endregion
+
+        #region SetState
+
+        /// <summary>
+        /// Used with the <see cref="CmdSetState"/> command to turn a device on or off
+        /// </summary>
+        public const string StateEnabled = "state_enabled";
+
+        #endregion
     }
 }