Converts SPC files to SP2.
The SP2 format was designed by Kevin Horton. marshallh and CaitSith2 created this conversion program. https://forums.nesdev.org/viewtopic.php?t=8558
SP2 format specification: http://blog.kevtris.org/blogfiles/spc2_file_specification_v1.txt
Usage: spc_pack.exe <DIRECTORY_OF_SPC_FILES>
Creates an .spc file in that directory's parent directory, with the same name as the SPC directory.