Added a bunch of guns and ammunition.
Add "single_reload" flag for items - some guns load one round at a time.
Layout for gun store.
Add items_gun_accessories, items tangentially related to firearms.
Include items_gun_accessories in std_gun_store_whales
items_gun_accessories
Put items in gun_store_aninimouse.map
Reformat world_terrain.dat a bit.
Add level-specific fuels to fields.  Refactor field fuel consumption.
Fire's ability to consume terrain scales with its size.
New struct for explosions.
Fully implement explosions.
Entity::take_damage_everywhere() deals damage to all body parts; overloaded for Player
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! key drops fire (retesting it).
Remove unused forward declaration of Field_type from explosion.h
Add an explosion to Field_fuel
Alter Field_fuel a bit.
Add Terrain_flag "explosive".
Better Field loading error handling.