[CI skip] Merge pull request #3315 from TerslenK/master

Re-adding gravity_affected_blocks.json and adding "GRAVITY_AFFECTED_BLOC…

src/main/java/io/github/thebusybiscuit/slimefun4/utils/tags/SlimefunTag.java

@@ -241,7 +241,12 @@ public enum SlimefunTag implements Tag<Material> {
     /**
      * All materials which benefit from the luck multiplier of {@link EnhancedFurnace}
      */
-    ENHANCED_FURNACE_LUCK_MATERIALS;
+    ENHANCED_FURNACE_LUCK_MATERIALS,
+
+    /**
+     * All materials that are affected by gravity.
+     */
+    GRAVITY_AFFECTED_BLOCKS;
 
     /**
      * Lookup table for tag names.

src/main/resources/tags/gravity_affected_blocks.json

@@ -0,0 +1,15 @@
+{
+    "values" : [
+        "minecraft:dragon_egg",
+        "minecraft:gravel",
+        "minecraft:sand",
+        "minecraft:red_sand",
+        "minecraft:scaffolding",
+        "#minecraft:anvil",
+        "#slimefun:concrete_powders",
+        {
+            "id" : "minecraft:pointed_dripstone",
+            "required" : false
+        }
+    ]
+}