Game setup installer

[FolkertVanVerseveld]

The original game was released on a CD-ROM and the setup program takes care of
the installation process. However, it would be nice if we could reverse engineer
the setup and figure out how the installation process takes place.

Porting the installer itself will probably be tracked in another issue, because
this issue is really big and takes a lot of time.

Currently, the following has to be implemented:

• Resource pather to patch resources from the original installer to the replicated one
• Machine OS type checking
• Command option parsing
• CD-ROM I/O handling

This list is not complete and subject to changes.

[FolkertVanVerseveld]

A simple setup game launcher has been implemented, but the code is getting
rusty. The user interface from empires/ui.hpp could be backported to this setup,
or even better, we could abstract the user interface code. I'm not sure whether
this should be integrated directly in the genie game engine or in a more
specific purpose library.