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.Shared/GameObjects/Components/Trigger/TriggerVisuals.cs

@@ -0,0 +1,20 @@
+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Triggers
+{
+    [NetSerializable]
+    [Serializable]
+    public enum TriggerVisuals
+    {
+        VisualState,
+    }
+
+    [NetSerializable]
+    [Serializable]
+    public enum TriggerVisualState
+    {
+        Primed,
+        Unprimed,
+    }
+}