Make gbagfx convert and compress in one step

[camthesaxman]

Seeing that so many of the graphics files are compressed, I think it would drastically improve build times if gbagfx was able to convert directly from example.png to example.4bpp.lz without creating a example.4bpp file first. A great deal of I/O would be reduced since the temporary example.4bpp file would not have to be written and then read again to be compressed.

[PikalaxALT]

Has this issue been resolved?

[meithecatte]

Because of how filesystem caching works, the file stays in RAM during the first build, and the graphics are not touched during most incremental builds. I don't think this is worth anyone's time.