Create a utility for registering renders for Blocks/Items

Almost direct copypasta from [my project](https://github.com/TehNut/ResourcefulCrops/blob/1.8/src/main/java/tehnut/resourceful/crops/util/helper/RenderHelper.java). Allows you to simply register models for Items/Blocks for given Metadata's.

Call these from your ClientProxy in postInit. A working example can be seen [here](https://github.com/TehNut/ResourcefulCrops/blob/1.8/src/main/java/tehnut/resourceful/crops/proxy/ClientProxy.java#L21-L25) [[Items](https://github.com/TehNut/ResourcefulCrops/blob/1.8/src/main/java/tehnut/resourceful/crops/registry/ItemRegistry.java#L42-L52)] [[Blocks](https://github.com/TehNut/ResourcefulCrops/blob/1.8/src/main/java/tehnut/resourceful/crops/registry/BlockRegistry.java#L30-L34)].

Review this a bit more closely. I did it from the web editor and it may not have worked 100% correctly.

src/main/java/WayofTime/alchemicalWizardry/client/InventoryRenderHelper.java

@@ -0,0 +1,79 @@
+package WayofTime.alchemicalWizardry.client;
+
+import net.minecraft.block.Block;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.ItemMeshDefinition;
+import net.minecraft.client.renderer.entity.RenderItem;
+import net.minecraft.client.resources.model.ModelBakery;
+import net.minecraft.client.resources.model.ModelResourceLocation;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemBlock;
+import net.minecraft.item.ItemStack;
+
+public class InventoryRenderHelper {
+
+    private static final String resourceBase = "alchemicalwizardry:";
+    
+    /**
+     * Registers a Model for the given Item and meta.
+     *
+     * @param item - Item to register Model for
+     * @param meta - Meta of Item
+     * @param name - Name of the model JSON
+     */
+    public static void itemRender(Item item, int meta, String name) {
+        if (item instanceof ItemBlock && name.startsWith("ItemBlock"))
+            name = name.replace("Item", "");
+
+        RenderItem renderItem = Minecraft.getMinecraft().getRenderItem();
+        String resName = resourceBase + name;
+
+        ModelBakery.addVariantName(item, resName);
+        renderItem.getItemModelMesher().register(item, meta, new ModelResourceLocation(resName, "inventory"));
+    }
+
+    /**
+     * Shorthand of {@code itemRender(Item, int, String)}
+     *
+     * @param item - Item to register Model for
+     * @param meta - Meta of Item
+     */
+    public static void itemRender(Item item, int meta) {
+        itemRender(item, meta, item.getClass().getSimpleName() + meta);
+    }
+
+    /**
+     * Shorthand of {@code itemRender(Item, int)}
+     *
+     * @param item - Item to register Model for
+     */
+    public static void itemRender(Item item) {
+        itemRender(item, 0, item.getClass().getSimpleName());
+    }
+
+    /**
+     * Registers a model for the item across all Meta's that get used for the item
+     *
+     * @param item - Item to register Model for
+     */
+    public static void itemRenderAll(Item item) {
+        RenderItem renderItem = Minecraft.getMinecraft().getRenderItem();
+        final Item toRender = item;
+
+        renderItem.getItemModelMesher().register(item, new ItemMeshDefinition() {
+            @Override
+            public ModelResourceLocation getModelLocation(ItemStack stack) {
+                return new ModelResourceLocation(resourceBase + toRender.getClass().getSimpleName(), "inventory");
+            }
+        });
+    }
+
+    /**
+     *
+     * @param block - Block to get Item of
+     * @return      - The ItemBlock that corresponds to the Block.
+     */
+    public static Item getItemFromBlock(Block block) {
+        return Item.getItemFromBlock(block);
+    }
+}