5 new triggers: EmptyContainers, Knockdown, Stun, TriggerOnThrowDoHit (#41472)

* ideas

* finish components

* systems

* one more

* requested

---------

Co-authored-by: iaada <iaada@users.noreply.github.com>

Content.Shared/Trigger/Systems/EmptyContainersOnTriggerSystem.cs

@@ -0,0 +1,81 @@
+using Content.Shared.Trigger.Components.Effects;
+using Robust.Shared.Containers;
+
+namespace Content.Shared.Trigger.Systems;
+
+/// <summary>
+/// Empty containers trigger system.
+/// </summary>
+public sealed class EmptyContainersOnTriggerSystem : XOnTriggerSystem<EmptyContainersOnTriggerComponent>
+{
+    [Dependency] private readonly SharedContainerSystem _container = default!;
+
+    protected override void OnTrigger(Entity<EmptyContainersOnTriggerComponent> ent, EntityUid target, ref TriggerEvent args)
+    {
+        if (!TryComp<ContainerManagerComponent>(target, out var containerComp))
+            return;
+
+        // Empty everything. Make sure a player isn't the target because they will get removed from their body along with their organs
+        if (ent.Comp.Container is null)
+        {
+            foreach (var container in _container.GetAllContainers(target, containerComp))
+            {
+                _container.EmptyContainer(container);
+            }
+
+            args.Handled = true;
+        }
+
+        // Empty containers in a sane way
+        else
+        {
+            foreach (var containerId in ent.Comp.Container)
+            {
+                if (!_container.TryGetContainer(target, containerId, out var container, containerComp))
+                    continue;
+
+                _container.EmptyContainer(container);
+                args.Handled = true;
+            }
+        }
+    }
+}
+
+/// <summary>
+/// Empty containers and delete items trigger system.
+/// </summary>
+public sealed class CleanContainersOnTriggerSystem : XOnTriggerSystem<CleanContainersOnTriggerComponent>
+{
+    [Dependency] private readonly SharedContainerSystem _container = default!;
+
+    protected override void OnTrigger(Entity<CleanContainersOnTriggerComponent> ent, EntityUid target, ref TriggerEvent args)
+    {
+        if (!TryComp<ContainerManagerComponent>(target, out var containerComp))
+            return;
+
+        // Empty everything. Make sure a player isn't the target because they will get DELETED
+        if (ent.Comp.Container is null)
+        {
+            foreach (var container in _container.GetAllContainers(target, containerComp))
+            {
+                _container.CleanContainer(container);
+            }
+
+            args.Handled = true;
+        }
+
+        // Empty containers in a sane way
+        else
+        {
+            foreach (var containerId in ent.Comp.Container)
+            {
+                if (!_container.TryGetContainer(target, containerId, out var container, containerComp))
+                    continue;
+
+                _container.CleanContainer(container);
+                args.Handled = true;
+            }
+        }
+    }
+}
+