Add cheese & dough reactions (#5547)

* git mv

* rename CreateEntityReaction -> CreateEntityTileReaction

* cheese

* change microwave recipes

* remove unnecessary test

* TryGet->Get

Content.Shared/Chemistry/Reaction/ReactionPrototype.cs

@@ -45,6 +45,12 @@ namespace Content.Shared.Chemistry.Reaction
 
         // TODO SERV3: Empty on the client, (de)serialize on the server with module manager is server module
         [DataField("sound", serverOnly: true)] public SoundSpecifier Sound { get; private set; } = new SoundPathSpecifier("/Audio/Effects/Chemistry/bubbles.ogg");
+
+        /// <summary>
+        /// If true, this reaction will only consume only integer multiples of the reactant amounts. If there are not
+        /// enough reactants, the reaction does not occur. Useful for spawn-entity reactions (e.g. creating cheese).
+        /// </summary>
+        [DataField("quantized")] public bool Quantized = false;
     }
 
     /// <summary>

Content.Shared/Chemistry/Reaction/SharedChemicalReactionSystem.cs

@@ -46,6 +46,17 @@ namespace Content.Shared.Chemistry.Reaction
                 if (!solution.ContainsReagent(reactantName, out var reactantQuantity))
                     return false;
 
+                if (reactantData.Value.Catalyst)
+                {
+                    // catalyst is not consumed, so will not limit the reaction. But it still needs to be present, and
+                    // for quantized reactions we need to have a minimum amount
+
+                    if (reactantQuantity == FixedPoint2.Zero || reaction.Quantized && reactantQuantity < reactantCoefficient)
+                        return false;
+
+                    continue;
+                }
+
                 var unitReactions = reactantQuantity / reactantCoefficient;
 
                 if (unitReactions < lowestUnitReactions)
@@ -53,7 +64,11 @@ namespace Content.Shared.Chemistry.Reaction
                     lowestUnitReactions = unitReactions;
                 }
             }
-            return true;
+
+            if (reaction.Quantized)
+                lowestUnitReactions = (int) lowestUnitReactions;
+
+            return lowestUnitReactions > 0;
         }
 
         /// <summary>