#2 Patch/Upgrade system for new releases

[Marcus Lindblom Sonestedt]

Recieved this by email. We need some sort of patching
system for new releases, to avoid downloading all the
20 mb (as it is currently) over and over.

If we separate the game engine from the content
properly, it should be possible for users to keep the
engine updated properly, while being able to select
which 'mission packs' to use.

Currently there are only two: 'tiny' for simple testing and
the 'real' mission. Once (if?) the users start producing
their own missions and scenarios, this number will rise.

There should exist tools for this.