.pak File Support

Quake 2 has a simple archive format called pak. I have added support for pak files. This will decrease the copy to memory stick rapidly. It also increases loading time a little bit. I have rewritten the memory management for those archive and they use much less memory. So it is acceptable to use them.
Sound

I have implemented sound in Quake 2 now. It is still very buggy and slow. Exspecially the sound during the id logo is pretty ugly because a lot of power is used for decoding the video data. But during the game it is very nice even if not all sound data is loaded so far.

Flipscreen support

You can set gu_flipscreen 1 in the console to turn around the psp viewing by ? (180°). So you can hold the psp upside down. I implemented this because I want to make Quake 2 as configurable as possible, but it is not in the menu because I think that not much players will use it and when you enable to it accidentally, it may be very confusing.