Changed AEGlassMaterial to Materials

Preparation in case we need more to support custom non solid, non
opaque, or similar blocks.
Removed custom fullSize/opaque blocks in favour of Material

src/main/java/appeng/block/networking/CreativeEnergyCellBlock.java

@@ -19,12 +19,12 @@
 package appeng.block.networking;
 
 import appeng.block.AEBaseTileBlock;
-import appeng.helpers.AEGlassMaterial;
+import appeng.helpers.AEMaterials;
 import appeng.tile.networking.CreativeEnergyCellTileEntity;
 
 public class CreativeEnergyCellBlock extends AEBaseTileBlock<CreativeEnergyCellTileEntity> {
 
     public CreativeEnergyCellBlock() {
-        super(defaultProps(AEGlassMaterial.INSTANCE));
+        super(defaultProps(AEMaterials.GLASS));
     }
 }