improved directory handling for menu, basic PSP support #10
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This is for better handling of directory listings in menu. The old version had a bug handling the "." directory reference.
It's also necessary to have a platform dependent reference to the data storage directory root, as e.g. the PSP should reference to ms0:/ for this.
The menubg_src parameters are also for PSP support, since the background image is copied from the frame buffer (that is, after scaling) and not from the emulation screen.