Groups have now memory
engine: Remove useless variable 'selectedOrder'
tmp: Dirty displaying of the mission path
Group now save memory for places around too
Groups now always have their full memory
Groups now share memories when finishing mission
Remove useless debugs
Map is now a service
Clean group visit code
Fix Map code
Fix memory code
GUI now display zones in memory
Zone now clearly display youth instead of infestation
Add some quick and very-dirty fix