factions holding the planet are now properly considered for spawns, not just their friends and neutrals

reduced mission waypoint spam during raid convoy missions

encounters are properly removed from the lists if the mission is ended with /npc mission end

Economy modifier addition fix

basic set of wreckages and abandoned structures added to the NPC provider

- ending missions with the "/npc mission end" command won't trigger negative economy/military effects
- Large fleet battle mission step type added
- Convoy raid mission step type added

/npc info command, fixed missing planet names

minor code cleanup

info commands output, formatting