Explosions and Grenades, Triggers, OnDestroy, OnExAct, Fueltanks and destructible tables (#247)

* initial explosiveComponent

* remove garbagee

* assets

* tile mass deletion baby

* grenades

* tweaks

* Update Content.Server/GameObjects/Components/Explosion/ExplosiveComponent.cs

Co-Authored-By: Pieter-Jan Briers <pieterjan.briers@gmail.com>

* Ex_act based on damage, fixes and tweaks

* One finishing touch

Done the most cringe way

* ex_act explosions, tables are destructible now

also adds fuel tanks

* adds ex_act to mobs

Content.Server/GameObjects/Components/Trigger/TimerTrigger/OnUseTimerTriggerComponent.cs

@@ -0,0 +1,44 @@
+using System;
+using Robust.Server.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Serialization;
+using Robust.Shared.GameObjects;
+using Content.Server.GameObjects.EntitySystems;
+using Content.Shared.GameObjects.Components.Triggers;
+
+namespace Content.Server.GameObjects.Components.Triggers
+{
+    public class OnUseTimerTriggerComponent : Component, IUse
+    {
+        #pragma warning disable 649
+        [Dependency] private readonly IEntitySystemManager _entitySystemManager;
+#pragma warning restore 649
+
+        public override string Name => "OnUseTimerTrigger";
+
+        private float _delay = 0f;
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(ref _delay, "delay", 0f);
+        }
+
+        public override void Initialize()
+        {
+            base.Initialize(); 
+        }
+
+        bool IUse.UseEntity(UseEntityEventArgs eventArgs)
+        {
+            var triggerSystem = _entitySystemManager.GetEntitySystem<TriggerSystem>();
+            if (Owner.TryGetComponent<AppearanceComponent>(out var appearance)) {
+                appearance.SetData(TriggerVisuals.VisualState, TriggerVisualState.Primed);
+            }
+            triggerSystem.HandleTimerTrigger(TimeSpan.FromSeconds(_delay), eventArgs.User, Owner);
+            return true;
+        }
+    }
+}