Fixes #675 No disabled feature should log spam or crash anymore.

Deprecates the old usage of the AEItemDefinitions via the direct method access of

* blocks()
* parts()
* items()
* materials()

and thus use the new re-direct via definitions().

All definitions are now initialized, no matter what. But SubItems, Items and Blocks are not registered, if by chance are disabled.

src/main/java/appeng/core/FeatureHandlerRegistry.java

@@ -0,0 +1,41 @@
+/*
+ * This file is part of Applied Energistics 2.
+ * Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
+ *
+ * Applied Energistics 2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Applied Energistics 2 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
+ */
+
+package appeng.core;
+
+
+import java.util.HashSet;
+import java.util.Set;
+
+import appeng.core.features.IFeatureHandler;
+
+
+public final class FeatureHandlerRegistry
+{
+	private final Set<IFeatureHandler> registry = new HashSet<IFeatureHandler>();
+
+	public void addFeatureHandler( IFeatureHandler feature )
+	{
+		this.registry.add( feature );
+	}
+
+	public Set<IFeatureHandler> getRegisteredFeatureHandlers()
+	{
+		return this.registry;
+	}
+}