Further Object resolvers updates

Streamlined base_list handling in game.zone:makeEntity (and resolvers.resolveObject) to prevent excessive reloading and processing entity lists.
Priority is type (if a base_list) then filter.base_list

Actor:addedToLevel: escorts will get an appropriate faction (hard_faction, game.zone.special_level_faction, summoner.faction)

game.state:applyRandomClass: converted equipment resolvers will allow power_source.nature (for Psyshots)

The I.D. sets special_level_faction = "enemies" for NPCs created after level generation

dialogs/debug/DebugMain.lua: fixed a bug that could cause no exp to be awarded when killing NPCs

See merge request !457