code cleanup

additional check, if leader has no target, but one of his squad members does, that squad member becomes the leader

doubled the radius in which the leader searches for other squadrons with valid hostile targets

- /npc spawn command updated, if keyword "fleet" is used instead of prefab name, whole fleet of ships from the certain faction is spawned
- new squadron behaviour, squadron leaders can now directly assign priority targets to other squadron members
- when squadron leader can't find any target, he looks to other nearby squadron leaders and picks their target if there is any
- squadrons limited to three members
- squadrons limited by grid size (large squadron leaders accept only large ships, small squadron leaders accept only small ships into their squadrons), allowing for distinct large ship squadrons and "fighter" squadrons

derelict NPC ships in wreckage encounters automatically disable medicals & survival kits when spawned as well

- NPC Provider cleanups should not consider all valid despawn grids without thrusters as subgrids (it was leaving a lot of trash behind)
- added logging for NPC Provider automatic cleanups (just in case)

fixed a case of economy stations not selling items when NPC faction gets to much economy power (over 200)

- wreckages automatically disable medicals & survival kits when spawned
- dereliction disables medicals & survival kits
- both to prevent random players spawning on these grids as they are set to nobody

- clamp max speed to max map speed if not defined, that prevents ship from burning thursters when reaching maximum speed in specific direction
- NPC ships do not use dampeners when flying, therefore it should lead to thursters being fired less (especially when they just move from A -> B)

/npc prefabs command now lists abandoned, prefabs and dangerous prefabs as well
/npc spawn command can spawn wreckages, and other prefabs without Provider remote configuration