Build a portable installer/utility/script

[foxtacles]

It should install the game by accepting a game disk file (or actual drive) and prepare the installation so that the game can fully run. It should also be possible to validate an existing installation. It could also be responsible for creating an initial .ini file. It could be part of config.exe.

This will solve quiet failures and crashes due to missing files. Due to the nature of how the game is built, it is infeasible (without rewriting a lot of code) to validate everything at game runtime.

Related to #123