Remove the one dependency on unicode for reading rom file

Fix handling of nocdrom

Minor compatibility change for BII support

Added helper functions and strings so BII compiles with bin/cue support

Perf: re-enable VOSF on Xcode-made, OSX-host builds

commented on use of SDL_SetRelativeMouseMode

made windowed-mode windows be resize-able/scale-able - guest OS displ…

…ay size is retained, though