New metal floor / Selective floor attribute stats

core/src/mindustry/world/blocks/environment/MetalFloor.java

@@ -0,0 +1,19 @@
+package mindustry.world.blocks.environment;
+
+import mindustry.world.meta.*;
+
+/** Class for quickly defining a floor with no water and no variants. Offers no new functionality. */
+public class MetalFloor extends Floor{
+
+    public MetalFloor(String name){
+        super(name);
+        variants = 0;
+        attributes.set(Attribute.water, -1);
+    }
+
+    public MetalFloor(String name, int variants){
+        super(name);
+        this.variants = variants;
+        attributes.set(Attribute.water, -1);
+    }
+}