Soft limit for max number of codes

[mlafeldt]

At the moment, the cheat engine has a compile option (MAX_CODES) defining the maximum number of code lines it can hold. This hard limit isn't that flexible.

Putting the memory constraints aside, it should generally be possible to activate as many codes as desired. To still have some control, the user can configure a soft limit.

See http://www.codemasters-project.net/vb/showthread.php?p=124367#post124367