Simplify NPC ship design

[Frolonov2]

Currently NPC ships with large number of parts are causing significant performance issue, especially during the creation of a scrapyard or war zone -multiple NPC ships are created simultaneously. Damage or destruction of NPC ships also create huge number of small fragments. If those ships are made of less but bigger blocks, performance issue might be solved.

Meanwhile, I test the battle against wormhole guardian in creative mode where 278 allied NPC warships from over 80 factions are spawn simultaneously in (0,0). This took the computer 2 ~3 minutes to load all ships, but most of them are inactive during the battle. It would be much easier for the computer if there're less ships with less parts but stronger turrets from each faction join in this battle. NPC ships should warp away from the region within 3 minutes after the battle ends to reduce system load.

[Frolonov2]

maybe simplifying most of the ships(cruiser/destroyer/freighter/miner) while keeping details on large battleships and stations would be a good idea. Also, the long list of ships generated by 'All against one' mission should belong to a common faction named like 'combined fleet' or 'the Grand Fleet' instead of their original factions, so there would not be such a long list in the galaxy map.