Remove top-level CMDLINE documentation file and generate multiple
CMDLINE files, one for each game.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2648
Update README to reflect the fact that Chocolate Doom now includes
multiple games.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2649
Update Windows build to generate multiple .zip packages, one for each
game.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2650
Reword CMDLINE template lead-in text to be game agnostic.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2651
Rework documentation system to generate INSTALL files tailored for the
different games.

Subversion-branch: /branches/v2-branch
Subversion-revision: 2652