Added configuration file for speed adjustment

Added PACMAN.INI configuration file for speed adjustments of the game. 
Game speed may vary considerably from machine to machine, even in differents operating systems like Freedos.

Speed adjustement

Speed of the game can be adjusted by configuring 2 values in pacman.ini file. 
Value on first line is sound effects delay, in milliseconds, and second line set game delay, also in milliseconds.

Here are some test that I made with differents configurations

REAL HARDWARE

Values tested with a notebook Toshiba Satellite 2995XDVD, running w98 (in pure dos mode) are:
1
20
Note: boot without any EMS memory manager like EMM386, otherwise performance will be severe degraded and monster will move in a strange manner

and running from windows: 
1
20

EMULATION

Runnin on DosBOX
0
10

Runnin on MS DOS 6.22 (on VirtualBox)
2
20
Note: boot without any EMS memory manager like EMM386, otherwise performance will be degraded and monsters will move in a strange manner

Runnin on Freedos (on VirtualBox)
2
20
Note: boot without any EMS memory manager like EMM386, otherwise performance will be degraded and monsters will move in a strange manner
In Freedos option number 3 (Load Freedos without drivers)