Fix vanilla Anvils, Saplings, and Slabs (#18)

* Fix Anvil display

* Fix growth stage 1 Saplings

* Fix top slabs and "smooth" double slabs

* comment on modded anvils

* spotless apply

* Only fix vanilla anvil

modded anvils can do it themselves

* Simplify

Thinking about this, I don't think there's a need to worry about the smooth double slabs.
There's a few reasons:
These blocks can only be obtained with commands. The only one this actually matters for is the sandstone one (43:9), since that's the only one that is visually different as well as has the wrong name. Holding 43:9 in your inventory will still have the wrong name anyway. Mods that add the modern minecraft ways of accessing these blocks create their own versions instead of using the old ones.

src/main/java/mcp/mobius/waila/addons/vanillamc/HUDHandlerVanilla.java

@@ -4,6 +4,8 @@
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockRedstoneOre;
+import net.minecraft.block.BlockStoneSlab;
+import net.minecraft.block.BlockWoodSlab;
 import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.init.Blocks;
 import net.minecraft.init.Items;
@@ -44,6 +46,8 @@ public class HUDHandlerVanilla implements IWailaDataProvider {
     static Block log = Blocks.log;
     static Block log2 = Blocks.log2;
     static Block quartz = Blocks.quartz_block;
+    static Block anvil = Blocks.anvil;
+    static Block sapling = Blocks.sapling;
 
     @Override
     public ItemStack getWailaStack(IWailaDataAccessor accessor, IWailaConfigHandler config) {
@@ -96,6 +100,18 @@ public ItemStack getWailaStack(IWailaDataAccessor accessor, IWailaConfigHandler
             return new ItemStack(block, 1, 2);
         }
 
+        if (block == anvil) {
+            return new ItemStack(block, 1, block.damageDropped(accessor.getMetadata()));
+        }
+
+        if (block == sapling) {
+            return new ItemStack(block, 1, block.damageDropped(accessor.getMetadata()));
+        }
+
+        if (block instanceof BlockStoneSlab || block instanceof BlockWoodSlab) {
+            return new ItemStack(block, 1, block.damageDropped(accessor.getMetadata()));
+        }
+
         return null;
 
     }
@@ -245,6 +261,10 @@ public static void register() {
         ModuleRegistrar.instance().registerStackProvider(provider, log.getClass());
         ModuleRegistrar.instance().registerStackProvider(provider, log2.getClass());
         ModuleRegistrar.instance().registerStackProvider(provider, quartz.getClass());
+        ModuleRegistrar.instance().registerStackProvider(provider, anvil.getClass());
+        ModuleRegistrar.instance().registerStackProvider(provider, sapling.getClass());
+        ModuleRegistrar.instance().registerStackProvider(provider, BlockStoneSlab.class);
+        ModuleRegistrar.instance().registerStackProvider(provider, BlockWoodSlab.class);
 
         // ModuleRegistrar.instance().registerStackProvider(provider, Block.class);
         ModuleRegistrar.instance().registerHeadProvider(provider, mobSpawner.getClass());