Hud refactor (#7202)

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>
Co-authored-by: Jezithyr <jmaster9999@gmail.com>
Co-authored-by: Jezithyr <Jezithyr@gmail.com>
Co-authored-by: Visne <39844191+Visne@users.noreply.github.com>
Co-authored-by: wrexbe <wrexbe@protonmail.com>
Co-authored-by: wrexbe <81056464+wrexbe@users.noreply.github.com>

Content.Client/Targeting/UI/TargetingDoll.xaml.cs

@@ -0,0 +1,44 @@
+using Content.Shared.Targeting;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.XAML;
+
+namespace Content.Client.Targeting.UI;
+
+[GenerateTypedNameReferences]
+public sealed partial class TargetingDoll : BoxContainer
+{
+    public static readonly string StyleClassTargetDollZone = "target-doll-zone";
+
+
+    private TargetingZone _activeZone = TargetingZone.Middle;
+
+    public event Action<TargetingZone>? OnZoneChanged;
+    public TargetingDoll()
+    {
+        RobustXamlLoader.Load(this);
+    }
+
+    public TargetingZone ActiveZone
+    {
+        get => _activeZone;
+        set
+        {
+            if (_activeZone == value)
+            {
+                return;
+            }
+
+            _activeZone = value;
+            OnZoneChanged?.Invoke(value);
+
+            UpdateButtons();
+        }
+    }
+    private void UpdateButtons()
+    {
+        ButtonHigh.Pressed = _activeZone == TargetingZone.High;
+        ButtonMedium.Pressed = _activeZone == TargetingZone.Middle;
+        ButtonLow.Pressed = _activeZone == TargetingZone.Low;
+    }
+}