Oldchat (#11913)

* attempt at moving MainViewport to UIWidget

* oldchat (prototype)

* separate oldchat and default ss14 HUD into their own files

* restores original default game screen logic and adds that logic into separated chat game screen

* hand reloading, several tweaks to port oldchat to main ss14 branch

oldchat is currently not selectable

* screen type cvar, gameplay state screen reloading/loading

* reload screen on ui layout cvar change

* fixes up basic reloading (HUD switching is still very bad)

* some UI widget reloading for main UI screen switching

* alert sync on screen change

* inventory reload

* hotbar margin fix

* chat bubbles above viewport

* whoops

* fixes ordering of speech bubble root

* should fix the chat focus issue (at least in-game, not lobby yet)

* should fix up the lobby/game chat focus

* fixes chat for lobby, turns lobby into a UI state

* viewport UI controller

* viewport ratio selection

* whoops

* adds the /tg/ widescreen ratio

* removes warning from inventory UI controller, adds background to separated chat game screen's chat portion

* menu button reload

* unload menu buttons only from gameplay state shutdown

* bugfix

* character button fix

* adds config options for viewport width/UI layout

* variable naming changes, get or null instead of get to avoid exceptions

* moves entity system get into controller

Content.Client/UserInterface/Systems/Hands/Controls/HandsContainer.cs

@@ -10,6 +10,12 @@ public sealed class HandsContainer : ItemSlotUIContainer<HandButton>
     public int ColumnLimit { get => _grid.Columns; set => _grid.Columns = value; }
     public int MaxButtonCount { get; set; } = 0;
 
+    /// <summary>
+    ///     Indexer. This is used to reference a HandsContainer from the
+    ///     controller.
+    /// </summary>
+    public string? Indexer { get; set; }
+
     public HandsContainer()
     {
         AddChild(_grid = new GridContainer());