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/Maps/ContentTileDefinition.cs

@@ -17,6 +17,7 @@ namespace Content.Shared.Maps
         public string DisplayName { get; private set; }
         public string SpriteName { get; private set; }
         public bool IsSubFloor { get; private set; }
+        public string SubFloor { get; private set; }
         public bool CanCrowbar { get; private set; }
         public string FootstepSounds { get; private set; }
         public float Friction { get; set; }
@@ -36,6 +37,10 @@ namespace Content.Shared.Maps
             {
                 IsSubFloor = node.AsBool();
             }
+            if (mapping.TryGetNode("subfloor", out var another_node))
+            {
+                SubFloor = another_node.AsString();
+            }
 
             if (mapping.TryGetNode("can_crowbar", out node))
             {