Major Refactoring of Bootstrap Code (#75)

- Refactored boostrap code:
  * Completely reworked item/block/tile registration.
  * Fixed server side startup.
  * Fixed server side startup.
  * More documentation.
  * More heavy cleanup
  * More cleanups.
  * Major refactoring of state mapping and fixes a lot of other issue related to item rendering.
  * Fixes sky chest item models (no item TESR).
  * Only use CachingRotatingBakedModel for tile entities automatically.
  Fix default rotation of quartz pillar for item model.
  * Used method reference instead of lambda for ItemMeshDefinition for multiparts.
  * Removed unnecessary IHasSpecialItemModel
  * Removed unused IconReg class.
  * Updated resource pack version.

src/main/java/appeng/bootstrap/components/ItemModelComponent.java

@@ -0,0 +1,42 @@
+package appeng.bootstrap.components;
+
+
+import java.util.Map;
+import javax.annotation.Nonnull;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.ItemModelMesher;
+import net.minecraft.client.renderer.block.model.ModelResourceLocation;
+import net.minecraft.item.Item;
+import net.minecraftforge.fml.relauncher.Side;
+
+
+/**
+ * Registers the models that should by used for an item, including the ability to
+ * distinguish by meta.
+ */
+public class ItemModelComponent implements InitComponent
+{
+
+	private final Item item;
+
+	private final Map<Integer, ModelResourceLocation> modelsByMeta;
+
+	public ItemModelComponent( @Nonnull Item item, @Nonnull Map<Integer, ModelResourceLocation> modelsByMeta )
+	{
+		this.item = item;
+		this.modelsByMeta = modelsByMeta;
+	}
+
+	@Override
+	public void initialize( Side side )
+	{
+		ItemModelMesher itemMesher = Minecraft.getMinecraft().getRenderItem().getItemModelMesher();
+
+		modelsByMeta.forEach( ( meta, model ) ->
+		{
+			itemMesher.register( item, meta, model );
+		} );
+	}
+	
+}