IniOption ALWAYS_FOOD and some default changes
- added ALWAYS_FOOD, allows to choose wether food items appear even when not using FOOD
- set Extra Civilians and Extra Merchants (blackmarket, etc.) to TRUE as default
- climbing with backpacks: no climbing, except if backpack is less or at 0.5 kg
- with current items, that's only the Tactical Sling (0.2 kg)