Add Modular grenades (chemnades). (#7138)

Content.Shared/Payload/Components/PayloadCaseComponent.cs

@@ -0,0 +1,12 @@
+namespace Content.Shared.Payload.Components;
+
+/// <summary>
+///     Component that enables payloads and payload triggers to function.
+/// </summary>
+/// <remarks>
+///     If an entity with a <see cref="PayloadTriggerComponent"/> is installed into a an entity with a <see
+///     cref="PayloadCaseComponent"/>, the trigger will grant components to the case-entity. If the case entity is
+///     triggered, it will forward the trigger onto any contained payload entity.
+/// </remarks>
+[RegisterComponent]
+public sealed class PayloadCaseComponent : Component { }