Inject waterloggable hoppers into the original TE's valid block set

This seems the best course of action, ensures it's got the right
datafixers, and leaves non-waterlogged hoppers with vanilla save data.

src/main/java/knightminer/inspirations/tweaks/InspirationsTweaks.java

@@ -1,5 +1,6 @@
 package knightminer.inspirations.tweaks;
 
+import com.google.common.collect.ImmutableSet;
 import knightminer.inspirations.common.Config;
 import knightminer.inspirations.common.PulseBase;
 import knightminer.inspirations.common.item.HidableItem;
@@ -22,10 +23,12 @@
 import net.minecraft.item.Food;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemGroup;
+import net.minecraft.item.Items;
 import net.minecraft.item.crafting.Ingredient;
 import net.minecraft.potion.EffectInstance;
 import net.minecraft.potion.Effects;
 import net.minecraft.potion.Potions;
+import net.minecraft.tileentity.TileEntityType;
 import net.minecraft.util.ActionResultType;
 import net.minecraft.util.Direction;
 import net.minecraft.util.math.BlockPos;
@@ -144,6 +147,20 @@ public void registerItem(Register<Item> event) {
 //		),  "silverfish_powder");
 	}
 
+	@SubscribeEvent
+	public void registerTileEntities(Register<TileEntityType<?>> event) {
+		if (Config.waterlogHopper.get()) {
+			// We need to inject our replacement hopper blocks into the valid ones for the TE type.
+			// It's an immutable set, so we need to replace it entirely.
+			// TODO: This isn't thread-safe with any other mods doing the same!
+			TileEntityType.HOPPER.validBlocks = new ImmutableSet.Builder<Block>()
+					.addAll(TileEntityType.HOPPER.validBlocks)
+					.add(dryHopper)
+					.add(wetHopper)
+					.build();
+		}
+	}
+
 	@SubscribeEvent
 	public void setup(FMLCommonSetupEvent event) {
 		// TODO: Forge needs to implement the ability to inject these into the loot tables.

src/main/resources/META-INF/accesstransformer.cfg

@@ -23,4 +23,7 @@ public net.minecraft.tileentity.LockableTileEntity field_174901_a # code
 public net.minecraft.world.LockCode field_180161_b # lock
 
 # Portal color
-public net.minecraft.client.renderer.chunk.ChunkRenderCache field_212408_i # world
+public net.minecraft.client.renderer.chunk.ChunkRenderCache field_212408_i # world
+
+# Hopper waterlogging - inject new blocks into TE
+public-f net.minecraft.tileentity.TileEntityType field_223046_I # validBlocks