Import binary data from external file

[archanox]

Could not include binary, baserom.gb

Add support for second and third params for INCBIN to accept offset and length of binary to include

INCBIN "baserom.gb", $43, $48 - $43

[archanox]

This needs to be read during run time of the compiled code, not during conversion.

[archanox]

If there are regions of bytes to be extracted from blobs, these can be split into separate files before compilation, and then loaded on the fly after it has been converted to c#.