Bug 153896 Improve the performance of BIRT datetime-converting
The current datetime converting algorithm in birt.core, xml&flatfile ODA implementations are not efficient enough.This is because we use java's SimpleDateTimeFormatter to parse ISO8601 compatible date/time values. We should write our own datatime string parser for ISO8601 datetime format.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
case DataType.BLOB_TYPE :
				return toBlob( source );
			case DataType.BINARY_TYPE :
				return toBytes( source );
			default :
				throw new BirtException( pluginId,
						ResourceConstants.INVALID_TYPE,
						resourceBundle );
		}
	}
	/**
	 * convert a object to given class
	 * Classes supported:
	 * 		Integer.class
	 * 		BigDecimal.class
	 * 		Boolean.class
     *      Time.class
	 * 		Date.class
	 * 		Double.class
	 * 		String.class
	 * 		Blob.class
	 * @param source
	 * @param toTypeClass
	 * @return
	 * @throws BirtException
	 */
	public static Object convert( Object source, Class toTypeClass )
			throws BirtException
	{
		if ( toTypeClass == DataType.getClass( DataType.ANY_TYPE ) )