Hardcode configuration file name to np2(1).ini instead of deriving it from the .exe file name

With the number of different builds increasing, this has gotten more and more annoying.
Change default configuration to the optimal settings for Touhou

* CPU clock multiplier: 20
* Sampling rate: 44 KHz
* Buffer: 100ms
* Enable save state support
* Change DIP switch settings to work with PoDD (via http://www.shrinemaiden.org/forum/index.php?topic=11117.0)
* Display frame rate and current CPU clock
* Disable F12 mapping (really, I panic every time when I accidentally F12 and my mouse cursor is suddenly gone)