ItemComponent syncing fixes:

- Relay and lightcomponent states are synced (otherwise clients won't be notified if the state is, for example, toggled by a signal from a button).
- Clients don't play door sounds if a signal attempts to set the state to the same value as the predicted state, but DO play if a correction from the server changes the state from the predicted one.
- Clients are notified if a reactor receives a shutdown signal.
- Powercontainer updates are sent if the charge changes by 1%, not by 1 unit.

Subsurface/Source/Items/Components/Machines/Reactor.cs

@@ -545,7 +545,11 @@ namespace Barotrauma.Items.Components
             switch (connection.Name)
             {
                 case "shutdown":
-                    shutDownTemp = 0.0f;
+                    if (shutDownTemp > 0.0f)
+                    {
+                        unsentChanges = true;
+                        shutDownTemp = 0.0f;
+                    }
                     break;
             }
         }