[fixedwing] convert nav_survey_rectangle to a module
[fixedwing] convert poly_survey_adv to a module
[fixedwing] convert border_line to a module
[fixedwing] nav_survey_rectangle back to subsystems
[fixedwing] convert nav_line to a module
[fixedwing] snav 'smooth navigation' as a module
[fixedwing] convert Osam navigation routines to a module. Common naming for start and run functions
[fixedwing][modules] clean advanced poly survey module
[fixedwing][modules] nav modules start and run functions