Implement some ioctl commands for disc0:/ files

http://report.ppsspp.org/logs/kind/59
http://report.ppsspp.org/logs/kind/33
http://report.ppsspp.org/logs/kind/110

I can't tell that my games are affected by these changes, but some of these commands seem like trouble if used and not implemented...

Still don't know what 9, a, and b do yet, and didn't implement 0x01020002 yet although I've reproduced it reading the path table.  Unfortunately my tests only work for a umd mounted so don't work with automated execution...

-[Unknown]