food values

- added a food multiplier based on the amount of humans where food values are x2 with 0 humans and x1 with 10 or more humans
- the spawn countdown timer for new humans (infants) stops if there isn't enough food to support them
- this means that food is less of a problem in the early game, but will keep it's intended "puzzle" for those that get to the late-game

changes & fixes

- fixed a pathfinding bug where items wouldn't get picked up
- this was also indirectly the cause for some cases where humans were constantly idle/praying/eating. So that's fixed now as well!
- fixed game freezing when a UFO is landing and there is no land in sight
- added a double check before quiting/restarting from the menu
- added a reset savefile option
- added names for humans with a length of 5 letters (previously up to 4)
- changed some compendium entries
- chickens should be less talkative