Navigator move get_time_inside and cleanup (#7062)

src/modules/navigator/mission.cpp

src/modules/navigator/mission.h

src/modules/navigator/mission_block.cpp

src/modules/navigator/mission_block.h

src/modules/navigator/navigator.h

src/modules/navigator/navigator_main.cpp

src/modules/navigator/navigator_mode.cpp

src/modules/navigator/navigator_mode.h

src/modules/navigator/rtl.cpp