Feature: Add ability to read binary file offset as beginning of xbe file

[RadWolfie]

By having ability to read from binary file's offset where xbe file is located can extend support for .bin and .(x)iso files on request. With this feature can reduce necessary to extract file contents from binary image. Plus, we can allocate minimal memory footprints to xbe's header structure and determined file size to allocate instead of allocate whole binary image unnecessary.

The feature will enable external tools using cli standalone usage to gain benefit of less extra effort to perform same work from single file.