Story mode map system

[fvultier]

Since PPS HS14 we have a campaign menu. Unfortunately this contains only a bunch of buttons. A story mode is still missing. The idea would be to implement some sort of map on which one could click on the next mission - possibly with a mission briefing screen or similar. Currently if you absolved mission N then you unlock mission N+1 and so on. More interesting wuold be a tree-like system. So after completion of mission N you can choose to play mission (N+1)A (cooperation with the aliens) or you can choose to play mission (N+1)B (cooperation with the human rebels). Maybe the decision is also dependent on the behaviour of the player in a level.

Steps:

• Unterstand how the current campaign menu works. How get missions started? How is saved which missions are already won?

• Experiment with CEGui (​http://www.orxonox.net/wiki/GUI)

• Implement new features in C++