[glob2-devel] Code cleaning

[Stephane Magnenat]

Hello,

I've created a new class, named ChooseMapScreen, which should be used whenever 
a map, game or campaign has to be loaded. The LoadGameScreen has been 
removed, and the CustomGameScreen inherits most of its functionnalities from 
ChooseMapScreen and is now very small (145 lines). The new class is fully 
documented.

So, if you need such a screen, use it.

Steph