City limit beyond 255

[bonesnap]

Hello,

Currently the game maxes out at 255 cities. This can be troublesome especially when playing on larger maps (thanks to this awesome utility). I was wondering if it was possible to add an option to increase the limit beyond 255.

Similarly, the maximum length of a city name I believe is 15 characters. Was also wondering if there could be an option to increase this as well.

To be honest I would love to create a pull request, but not really sure how to get started with this repo. The source files appear to be written in Delphi or Pascal? I haven't worked with Pascal since high school (many moons ago) but wouldn't mind brushing up as a fun, little side project. But again not really sure how to get started or which files to modify. Maybe a small contribution guide would be beneficial?

Thanks for this awesome utility; finding it has made my year!