GCW0: OPK: Open with a GBA ROM or ZIP file.
GCW0: Added .gitignore to hide OPK files
GCW Zero: Add two GBA SP icons drawn by hi-ban. Use regba-silver.png as the application's icon.

hi-ban drew the GBA SP icons because the GBA SP is an improvement over the original GBA, much like ReGBA is an improvement over the original gpSP.