Demiplan modifiers (#526)

* simple modifiers

* modifier tag filtering

* Update CP14DemiplanSystem.Generation.cs

* Update rocks.yml

* move loot to modifier

* move enemies to modificators

* fix filtering

* modifier rariry

* reward and difficulty limits

* rebalance and optimize calculation

* Update test.yml

* wizden PR copy

* move all alchemy reagents to modifiers

Content.Shared/Procedural/DungeonLayers/OreDunGen.cs

@@ -1,3 +1,4 @@
+using Content.Shared.Maps;
 using Robust.Shared.Prototypes;
 
 namespace Content.Shared.Procedural.DungeonLayers;
@@ -12,10 +13,16 @@ namespace Content.Shared.Procedural.DungeonLayers;
 public partial class OreDunGen : IDunGenLayer
 {
     /// <summary>
-    /// If the vein generation should occur on top of existing entities what are we replacing.
+    /// This vein can only be generated by replacing the specified entities.
     /// </summary>
     [DataField]
-    public EntProtoId? Replacement;
+    public HashSet<EntProtoId>? EntityMask;
+
+    /// <summary>
+    /// This vein can only be generated on the specified tiles
+    /// </summary>
+    [DataField]
+    public HashSet<ProtoId<ContentTileDefinition>>? TileMask;
 
     /// <summary>
     /// Entity to spawn.