Refactoring of solar control console (#4072)

* Refactor/fix client-side of solar control computer (introduce ComputerBoundUserInterface & fix bugs)

* Refactor server side of solar control computer (introduce BaseComputerUserInterfaceComponent)

* If you can't interact, then messages to computers are blocked.

* Add 'not powered' messages, migrate activation logic partially to an EntitySystem

* Move solar control console to a XAML UI

* Remove useless comment on UserInterfaceKey

* BaseComputerUserInterfaceComponent: Remove EnsureComponent<PowerReceiver>, it's not necessary

* Fix solar panel occlusion check direction

* Solar Control Console refactors/etc. : Handle namespace renames

Content.Server/GameObjects/EntitySystems/ComputerUIActivatorSystem.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Linq;
+using Content.Shared.Interaction;
+using Content.Server.GameObjects.Components;
+using Content.Shared.GameTicking;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+using JetBrains.Annotations;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    internal sealed class ComputerUIActivatorSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<BaseComputerUserInterfaceComponent, ActivateInWorldEvent>(HandleActivate);
+        }
+
+        private void HandleActivate(EntityUid uid, BaseComputerUserInterfaceComponent component, ActivateInWorldEvent args)
+        {
+            component.ActivateThunk(args);
+        }
+    }
+}