Fix bug with chemical reactions which cause other reactions (#475)

SolutionComponent.CheckForReaction only checks for a reaction once, meaning that if a reaction generates reagents that create a solution that's valid for another reaction, that second reaction doesn't occur. This fixes that by repeatedly checking for a reaction until no more occur.

Content.Server/GameObjects/Components/Chemistry/SolutionComponent.cs

@@ -191,6 +191,9 @@ namespace Content.Server.GameObjects.Components.Chemistry
         }
 
         private void CheckForReaction()
+        {
+            bool checkForNewReaction = false;
+            while (true)
             {
                 //Check the solution for every reaction
                 foreach (var reaction in _reactions)
@@ -198,9 +201,19 @@ namespace Content.Server.GameObjects.Components.Chemistry
                     if (SolutionValidReaction(reaction, out int unitReactions))
                     {
                         PerformReaction(reaction, unitReactions);
-                    break; //Only perform one reaction per solution per update.
+                        checkForNewReaction = true; 
+                        break;
                     }
                 }
+
+                //Check for a new reaction if a reaction occurs, run loop again.
+                if (checkForNewReaction)
+                {
+                    checkForNewReaction = false;
+                    continue;
+                }
+                return;
+            }
         }
 
         public bool TryAddReagent(string reagentId, int quantity, out int acceptedQuantity, bool skipReactionCheck = false, bool skipColor = false)