Analysis and reimplementation of Railroad Tycoon 3

The old executable is at ./rt3_wineprefix/drive_c/rt3/RT3.exe

Our task is to understand the executable's structure and build a function-by-function rewrite in Rust. As we go, we will document the file formats and functions and write unit and integration tests.

We will build a dll which we can inject into the original exe, patching in individual functions as we build them out.