Fix preview building reservoir such original game. Add runtime picture group. Fix SdlFacade::copyPicture function.
Merge branch 'master' of https://github.com/gecube/opencaesar3 into vs2008-added
PicLoader::get_pic_id_by_name -> TerrainTileHelper::convPicName2Id
Senate move to oc3_senate.hpp/cpp. Only one senate may constructed in the city. oc3_water_buildings.cpp small refactoring.
Change city walker api.
Immigrant move to oc3_immigrant.hpp/cpp. Small refactoring city class: walkers and overlays move to implementation.
Add walkermananger. Fix behavior emigrant when house already full. Now when how destroyed it produced homeless.
changes from dalerank with fixes to gcc