Improved Schematic Class

Improved the Schematic class. Added support for reading schematic files.
That functionality still needs to be integrated and tested. Made minor
changes to WorldOperation and its derived classes. Also fixed a few bugs
in Schematic's export functions that were found during testing. The
exporting code still doesn't do all the changes (e.g. block
standardization) that had been implemented before.

StevenDimDoors/mod_pocketDim/schematic/InvalidSchematicException.java

@@ -0,0 +1,21 @@
+package StevenDimDoors.mod_pocketDim.schematic;
+
+public class InvalidSchematicException extends Exception {
+
+	private static final long serialVersionUID = -1011044077455149932L;
+
+	public InvalidSchematicException()
+	{
+		super();
+	}
+	
+	public InvalidSchematicException(String message)
+	{
+		super(message);
+	}
+	
+	public InvalidSchematicException(String message, Throwable cause)
+	{
+		super(message, cause);
+	}
+}