Make CTM extendable and make ctm field of RenderBlocksCTM nonstatic

src/main/java/com/cricketcraft/chisel/api/rendering/CTM.java

@@ -68,9 +68,9 @@ import static com.cricketcraft.chisel.api.rendering.Dir.*;
 public class CTM {
 
 	/** Some hardcoded offset values for the different corner indeces */
-	private static int[] submapOffsets = { 4, 5, 1, 0 };
-	private static TIntObjectMap<Dir[]> submapMap = new TIntObjectHashMap<Dir[]>();
-	private static EnumMap<Dir, Boolean> connectionMap = Maps.newEnumMap(Dir.class);
+	protected static int[] submapOffsets = { 4, 5, 1, 0 };
+	protected static TIntObjectMap<Dir[]> submapMap = new TIntObjectHashMap<Dir[]>();
+	protected static EnumMap<Dir, Boolean> connectionMap = Maps.newEnumMap(Dir.class);
 	/** For use via the Chisel 2 config only, altering this could cause unintended behavior */
 	public static boolean disableObscuredFaceCheckConfig = false;
 
@@ -87,7 +87,7 @@ public class CTM {
 		submapMap.put(3, new Dir[] { TOP, LEFT, TOP_LEFT });
 	}
 	
-	private CTM() {
+	protected CTM() {
 	}
 
 	public static CTM getInstance() {

src/main/java/com/cricketcraft/chisel/api/rendering/RenderBlocksCTM.java

@@ -148,7 +148,7 @@ public class RenderBlocksCTM extends RenderBlocks {
 		}
 	}
 
-	protected static CTM ctm = CTM.getInstance();
+	public CTM ctm = CTM.getInstance();
 
 	// globals added to save the JVM some trouble. No need to constantly create
 	// and destroy ints if we don't have to