H.O.N.K. mech (#14670)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Mech/MechUI.cs

@@ -67,6 +67,21 @@ public sealed class MechGrabberEjectMessage : MechEquipmentUiMessage
     }
 }
 
+/// <summary>
+/// Event raised for the soundboard equipment to play a sound from its component
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class MechSoundboardPlayMessage : MechEquipmentUiMessage
+{
+    public int Sound;
+
+    public MechSoundboardPlayMessage(EntityUid equipment, int sound)
+    {
+        Equipment = equipment;
+        Sound = sound;
+    }
+}
+
 /// <summary>
 /// BUI state for mechs that also contains all equipment ui states.
 /// </summary>
@@ -100,3 +115,12 @@ public sealed class MechGrabberUiState : BoundUserInterfaceState
     public List<EntityUid> Contents = new();
     public int MaxContents;
 }
+
+/// <summary>
+/// List of sound collection ids to be localized and displayed.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class MechSoundboardUiState : BoundUserInterfaceState
+{
+    public List<string> Sounds = new();
+}