fix imports

oh man the imports are blocking the go get command
plaese use only github.com/freeflightsim/... (like the url is after you open the page) as import path
i got 3 copys of the go-fgms repo after try to 'go get'
- github.com/fgx/go-fgms
- github.com/freeflightsim/go-fgms
- github.com/FreeFlightSim/go-fgms
where i fix the fitst case but i still don't know why i had a copy called "github.com/FreeFlightSim/go-fgms"