Allow loading of GB/GBC titles, for games that include "GBA Enhanced" features

[HeyItsLollie]

There's a few select titles in the Game Boy Color library that include "enhanced" features when played on a GBA:

• The Legend of Zelda - Oracle of Ages / Oracle of Seasons
• Shante
• Wendy - Every Witch Way

This GBA core doesn't currently see GB/GBC games in its file browser, so it'd be nice to see that expanded.