Release 1.0 Hotfix #8b

Ticket #1960 QOL- Planetary gravity generator active changes gravity type in empire and planet to species norm
Ticket #1961 Case where building scrapping would have wrong index after bombardment
Ticket #1962 Critical- Fix for rare case where AI retreat could cause a softlock
Ticket #1963 Case where warp amplifiers could not be built after multiple system occupations
Ticket #1964 Fix for rare case of build queue ship duplication
Ticket #1965 Fix for rare case of research selection menu appearing after leader menu
Ticket #1966 Case of refitted ships having too high ship strength