Unsuckifying Thunderbolts/Adeptas Avenger/Xiphon

[Surrealaser]

1. Rosigma Thunderbolt improvements made standard.
2. Adeptas Avenger stats made more in line with the Rosigma Lightning; given an additional +7 hit bonus due to devoted gunner.
3. Xiphon given 1 armor, 5 dodge, 5 hit bonus and repair rates on par with other basic interceptors; less speedy and maneuverable but more accurate.