added couple of vanilla dangerous and abandoned encounters

Naming convention extended to drones so they are easier to clean up

custom icon in the Faction definition will now work, there was a half assed system in the provider, but I removed it in favour of the new options coming from the recent update

NPC faction can always spawn it's encounters in it's own territory

new admin commands, commands code cleanup and attribute checks
/npc setcontrol <planet>;<faction>;<control>
/npc setmodifier <faction>;<modifier>;<value>
/npc resetrep <ident>

spawner fix, when anything fails during the spawner "spawn" phase, it gets removed from the list, thus not blocking other spawners, the error gets reported in keen log

/npc economy sellprefabs command fixed to properly handle free ports

MinimalPricePerUnit 0 is not being used for price calculation of prefabs

commenting out some unfinished code

automatic data cleanup on init fixed, missing null check when no ownership and no siege defs existed