GitLab

moved unit destroy logic to cDestroyJob and delay deletion of units to match the explosion animation

- introduce cBuilding::isRubble to identiufy rubble (instead of assuming that owner == nullptr means unit is rubble);
- make rubbleType & rubbleValue private

moved 'done' flag from model code to cGameGuiController. Moved logic for selecting next/previous unit from model code to cUnitSelection

when a field is blocked by a moving unit, don't recalculate path, but just wait until it gets free. This will improve behaviour of group moves.