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/IItemRendering.java

@@ -0,0 +1,69 @@
+package appeng.bootstrap;
+
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import net.minecraft.client.renderer.ItemMeshDefinition;
+import net.minecraft.client.renderer.block.model.ModelResourceLocation;
+import net.minecraft.client.renderer.color.IItemColor;
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
+
+
+/**
+ * Allows the rendering of an item to be customized.
+ */
+public interface IItemRendering
+{
+
+	/**
+	 * Registers a custom item mesh definition that will be used to dynamically determine the
+	 * item model to be used for rendering by inspecting the item stack (i.e. for NBT data).
+	 * Please
+	 */
+	@SideOnly( Side.CLIENT )
+	IItemRendering meshDefinition( ItemMeshDefinition meshDefinition );
+
+	/**
+	 * Registers an item model for meta=0, see {@link #model(int, ModelResourceLocation)}.
+	 */
+	@SideOnly( Side.CLIENT )
+	default IItemRendering model( ModelResourceLocation model )
+	{
+		return model( 0, model );
+	}
+
+	/**
+	 * Registers an item model for a given meta.
+	 */
+	@SideOnly( Side.CLIENT )
+	IItemRendering model( int meta, ModelResourceLocation model );
+
+	/**
+	 * Convenient override for {@link #variants(Collection)}.
+	 */
+	@SideOnly( Side.CLIENT )
+	default IItemRendering variants( ResourceLocation... resources )
+	{
+		return variants( Arrays.asList( resources ) );
+	}
+
+	/**
+	 * Registers the item variants of this item. This are all models that need to be loaded for this item.
+	 * This has no direct effect on rendering, but is used to load models that are used for example by
+	 * the ItemMeshDefinition.
+	 *
+	 * Models registered via {@link #model(int, ModelResourceLocation)} are automatically added here.
+	 */
+	@SideOnly( Side.CLIENT )
+	IItemRendering variants( Collection<ResourceLocation> resources );
+
+	/**
+	 * Registers a custom item color definition that inspects an item stack and tint and
+	 * returns a color multiplier.
+	 */
+	@SideOnly( Side.CLIENT )
+	IItemRendering color( IItemColor itemColor );
+}